Paleokarst landform of the weathering crust of Middle Permian Maokou Formation in Sichuan Basin and selection of exploration regions

doi:10.7623/syxb201206005

Editorial office of ACTA PETROLEI SINICA ›› 2012, Vol. 33 ›› Issue (6): 949-960.DOI: 10.7623/syxb201206005

• Petroleum Exploration • Previous Articles Next Articles

Paleokarst landform of the weathering crust of Middle Permian Maokou Formation in Sichuan Basin and selection of exploration regions

JIANG Qingchun 1　 HU Suyun 1　 WANG Zecheng 1 　CHI Yingliu 1　YANG Yu 2　 LU Weihua 1 　WANG Haizhen 1　 LI Qiufen 1

Received:2012-04-29 Revised:2012-08-10 Online:2012-11-25 Published:2012-12-07

四川盆地茅口组风化壳岩溶古地貌及勘探选区

江青春 1 　胡素云 1　汪泽成 1　池英柳 1　杨雨 2 　鲁卫华 1 　王海真 1 　李秋芬 1

1. 中国石油勘探开发研究院北京 100083; 2. 中国石油西南油气田公司勘探开发研究院四川成都 610051

通讯作者: 江青春
作者简介:江青春，男，1980年4月生，2007年获中国石油大学（北京）硕士学位，现为中国石油勘探开发研究院工程师，主要从事碳酸盐岩沉积储层研究。
基金资助:
国家重大科技专项“海相碳酸盐岩油气资源潜力与大油气田形成条件、分布规律研究”（2011ZX05004-001）资助。

Abstract

Abstract:

In view of incomplete understanding on distribution characteristics of paleokarst landform of Maokou Formation in Sichuan Basin, we studied the geological and geophysical response of karst reservoirs and made a detailed stratigraphic correlation of more than 200 exploratory wells of Maokou Formation in the whole basin. Based on this, we depicted in detail Maokou Formation palaeogeomorphology by using two palaeogeomorphologic analysis methods, impression method and residual thickness method, and proposed that there developed three geomorphic units in Maokou Formation, karst depression, karst slope and karst highland, which are characterized by "three highlands, two slopes and two depressions". Formations of the karst depression are basically well preserved, and the Mao-4 section and a part of the Mao-3 section have been missing in the karst highland, while the hiatus of the karst slope is medium between the highland and the depression. This conclusion made a breakthrough at the previous understanding on Maokou Formation weathering crust paleo-geomorphology, which holds a "two highlands" view. On the basis of this new conclusion and characteristics of the hydrocarbon generating intensity of source rocks, four favorable exploration zones of Maokou Formation were proposed in the paper.

Key words: Sichuan Basin, Middle Permian, Maokou Formation, karst reservoir, paleokarst landform, favorable exploration zone

摘要：

针对四川盆地中二叠统茅口组顶部岩溶古地貌分布特征认识不清的问题，开展了岩溶储层的地质及地球物理响应分析，同时对全盆地200余口探井的茅口组开展了详细的地层对比，在此基础上利用印模法和残余厚度法2种古地貌分析方法开展了茅口组顶部古地貌形态的精细刻画，指出茅口组顶部发育岩溶洼地、岩溶斜坡和岩溶高地3种地貌单元，古地貌具有“三高地、两斜坡、两洼地”的特点，岩溶洼地地层保存基本完整，岩溶高地缺失茅口组四段和部分茅口组三段，岩溶斜坡的地层缺失介于岩溶高地和岩溶洼地之间。突破了前人对茅口组风化壳古地貌存在“两高地”的认识，根据这一新认识并结合烃源岩生烃强度特征将茅口组顶部风化壳岩溶储层划分为4个有利勘探区带。

关键词: 四川盆地, 中二叠统, 茅口组, 岩溶储层, 岩溶古地貌, 有利勘探区带

JIANG Qingchun HU Suyun WANG Zecheng CHI Yingliu YANG Yu LU Weihua. Paleokarst landform of the weathering crust of Middle Permian Maokou Formation in Sichuan Basin and selection of exploration regions[J]. Editorial office of ACTA PETROLEI SINICA, 2012, 33(6): 949-960.

江青春胡素云汪泽成池英柳杨　雨鲁卫华. 四川盆地茅口组风化壳岩溶古地貌及勘探选区[J]. 石油学报, 2012, 33(6): 949-960.

References

[1] 张兵，郑荣才，王绪本，等.四川盆地东部黄龙组古岩溶特征与储集层分布[J].石油勘探与开发，2011，38（3）：257-267.

Zhang Bing,Zheng Rongcai,Wang Xuben,et al.Paleokarst and reservoirs of the Huanglong Formation in eastern Sichuan Basin[J].Petroleum Exploration and Development，2011，38（3）：257-267.

[2] 文华国，郑荣才，沈忠民，等.四川盆地东部黄龙组古岩溶地貌研究[J].地质论评，2009，55（6）：816-827.

Wen Huaguo,Zheng Rongcai,Shen Zhongmin,et al.Study on the Carboniferous palaeokarst landform in eastern Sichuan Basin[J].Geological Review，2009，55（6）：816-827.

[3] 周鹏.塔里木盆地和田古隆起构造演化及油气关系[D].成都：成都理工大学，2002.

Zhou Peng.Tectonic evolution of Hetian paleo-uplift in Tarim Basin and its relation to oil and gas[D].Chengdu:Chengdu University of Technology,2002.

[4] 杨华，黄道军，郑聪斌.鄂尔多斯盆地奥陶系岩溶古地貌气藏特征及勘探进展[J].中国石油勘探，2006，11(3):1-6.

Yang Hua,Huang Daojun,Zheng Congbin.Characteristics of gas reservoir and exploration achievement for Ordovician paleokarst landform in Ordos Basin[J].China Petroleum Exploration,2006，11(3):1-6.

[5] 刘洪军，贾亚妮，李振宏，等.岩溶盆地中微隆起带的存在及意义--以鄂尔多斯盆地奥陶纪岩溶古地貌为例[J].天然气地球科学，2006，17（4）：490-493.

Liu Hongjun,Jia Yani,Li Zhenhong,et al.Existence and significance of microumbones in karst basin:sample from Ordovician karstic paleogeomorphy in Ordos Basin[J].Natural Gas Geoscience,2006,17（4）：490-493.

[6] 鲁新便.缝洞型碳酸盐岩油藏开发描述及评价[D].成都：成都理工大学，2004.

Lu Xinbian.The development and estimation of fracture and vug carbonate reservoir[D].Chengdu:Chengdu University of Technology,2004.

[7] 康志宏，吴铭东.利用层序地层学恢复岩溶古地貌技术--以塔河油田6区为例[J].新疆地质，2003，21(3)：290-293.

Kang Zhihong，Wu Mingdong.Technology of recovering ancient geomorphy though sequence stratigraphy:a case study in Tahe 6th reservoir，Tarim Basin[J].Xinjiang Geology，2003，21(3):290-293.

[8] Liu Jingyan，Lin Changsong，Cai Zhenzhong，et al.Palaeogeomorphology and its control on the development of sequence stratigraphy and depositional systems of the Early Silurian in the Tarim Basin[J].Petroleum Science，2010，7（3）:311-322.

[9] McLaren S J，Gilbertson D D，Grattan J P，et al.Quaternary palaeogeomorphologic evolution of the Wadi Faynan area,southern Jordan[J].Palaeogeography,Palaeoclimatology,Palaeoecology,2004，205(1/2):131-154.

[10] 彭莉.塔中隆起奥陶纪古地貌及其对碳酸盐岩储层的控制[D].北京：中国地质大学，2007.

Peng Li.The recovery of paleogeomorphology and its influence on the sedimentary facies in Ordovician in Tazhong area[D].Beijing:China University of Geosciences，2007.

[11] 康志宏.塔河碳酸盐岩油藏岩溶古地貌研究[J].新疆石油地质，2006，27（5）:522-525.

Kang Zhihong.The karst palaeogeomorphology of carbonate reservoir in Tahe oilfield[J].Xinjiang Petroleum Geology，2006,27（5）:522-525.

[12] 马永生，蔡勋育，赵培荣，等.四川盆地大中型天然气田分布特征与勘探方向[J].石油学报,2010,31(3):347-354.

Ma Yongsheng，Cai Xunyu，Zhao Peirong，et al.Distribution and further exploration of the large-medium sized gas fields in Sichuan Basin[J].Acta Petrolei Sinica,2010,31(3):347-354.

[13] 何自新，郑聪斌，陈安宁，等.长庆气田奥陶系古沟槽展布及其对气藏的控制[J].石油学报，2001，22（4）：35-38.

He Zixin，Zheng Congbin，Chen Anning，et al.Distributive configuration of ancient valley-trough on Ordovician erosion surface in Changqing gas field and its control over gas accumulations[J].Acta Petrolei Sinica，2001，22（4）：35-38.

[14] 严威，王兴志，张廷山，等.塔河油田加里东中期第Ⅲ幕岩溶作用[J].石油学报，2011，32（3）：411-416.

Yan Wei，Wang Xingzhi，Zhang Tingshan，et al.Investigations of the karst during the episode Ⅲ of the mid-Caledonian in the Tahe oilfield[J].Acta Petrolei Sinica，2011，32（3）：411-416.

[15] 罗冰，谭秀成，李凌，等.蜀南地区长兴组顶部岩溶不整合的发现及其油气地质意义[J].石油学报，2010，31（3）：408-414.

Luo Bing，Tan Xiucheng，Li Ling,et al.Discovery and geologic significance of paleokarst unconformity between Changxing Formation and Feixianguan Formation in Shunan area of Sichuan Basin[J].Acta Petrolei Sinica，2010，31（3）：408-414.

[16] 王世谦.四川盆地第三次油气资源评价报告[R].成都：中国石油西南油气田公司研究院，2002.

Wang Shiqian.The third oil and gas resource evaluation report of Sichuan Basin[R].Chengdu:Research Institute of PetroChina Southwest Oil & Gas Field Company,2002.

[17] 王运生，金以钟.四川盆地下二叠统白云岩及古岩溶的形成与峨嵋地裂运动的关系[J].成都理工学院学报，1997，24（1）：8-16.

Wang Yunsheng，Jin Yizhong.The formation of dolomite and paleokarst of the Lower Permian series in Sichuan Basin and the relation to the Emei taphrogenesis[J].Journal of Chengdu University of Technology，1997，24（1）：8-16.

[18] 陈宗清.四川盆地中二叠统茅口组天然气勘探[J].中国石油勘探,2007,12(5):1-11.

Chen Zongqing.Exploration for natural gas in Middle Permian Maokou Formation of Sichuan Basin[J].China Petroleum Exploration,2007,12(5):1-11.

[19] 胡望水.四川盆地原型盆地恢复[R].荆州：长江大学，2011.

Hu Wangshui.Reconstruction of proto-basin in Sichuan Basin[R].Jingzhou:Yangtze University,2011.

[20] 四川油气区石油地质志编写组.中国石油地质志:卷十[M].北京：石油工业出版社，1991.

Sichuan Oil and Gas Field Drafting Group of Petroleum Geology of China.Petroleum geology of China:volume 10[M].Beijing:Petroleum Industry Press,1991.

[21] 胡世忠.论东吴运动构造事件与二叠系分统界线问题[J].地层学杂志，1994，18（4）：309-315.

Hu Shizhong.On the event of Dongwu movement and its relation with Permian subdivision[J].Journal of Stratigraphy,1994，18（4）：309-315.

[22] 冯少南.东吴运动的新认识[J].现代地质，1991，5（4）：378-384.

Feng Shaonan.New knowledge on Dongwu movement[J].Geoscience，1991，5（4）：378-384.

[23] 陈维涛，周瑶琪，马永生，等.关于龙门山地区东吴运动的存在及其性质的认识[J].地质学报，2007，81（11）：1518-1525.

Chen Weitao，Zhou Yaoqi，Ma Yongsheng，et al.The knowledge on the existence and nature of the Dongwu movement in the Longmen mountain area[J].Acta Geologica Sinica，2007，81（11）：1518-1525.

[24] 张祖圻.论东吴运动[J].煤田地质与勘探，1983，4（3）：14-21.

Zhang Zuxin.Disscussing Dongwu movement[J].Coal Geology & Exploration，1983，4（3）：14-21.

[25] 陈显群,刘应楷,童鹏.东吴运动质疑及川黔运动之新见[J].石油与天然气地质,1987,8(4):412-423.

Chen Xianqun,Liu Yingkai,Tong Peng.Query about Dongwu movement new opinion on Chuanqian movement[J].Oil & Gas Geology,1987,8(4):412-423.

[26] 朱传庆，徐明，袁玉松，等.峨眉山玄武岩喷发在四川盆地的地热学响应[J].科学通报，2010，55（6）：474-482.

Zhu Chuanqing,Xu Ming,Yuan Yusong,et al.Palaeogeothermal response and record of the effusing of Emeishan basalts in the Sichuan Basin[J].Chinese Science Bulletin,2010,55(10):949-956.

[27] 梁定益，聂泽同，宋志敏.扬子西缘东吴伸展运动[J].地球科学--中国地质大学学报，1994，19（4）：443-453.

Liang Dingyi，Nie Zetong，Song Zhimin.Extensional Dongwu movement in western margin of Yangtze region[J].Earth Science:Journal of China University of Geosciences，1994，19（4）：443-453.

[28] 何斌，徐义刚，王雅玫，等.东吴运动性质的厘定及其时空演变规律[J].地球科学--中国地质大学学报，2005，30（1）：89-96.

He Bin，Xu Yigang，Wang Yamei，et al.Nature of the Dongwu movement and its temporal and spatial evolution[J].Earth Science:Journal of China University of Geosciences,2005，30（1）：89-96.

[29] 陈宗清.川西南地区二、三叠系碳酸盐岩断带裂缝气藏[J].石油学报,1995,16(3):37-43.

Chen Zongqing.Fractured gas pools in Permian and Triassic carbonate rock faulted zone of south-west Sichuan region[J].Acta Petrolei Sinica,1995,16(3):37-43.

[30] 陈更生，岳宏.四川盆地川西南地区下二叠统气藏类型及有效缝洞分布规律[J].天然气工业,1995,15(6):10-13.

Chen Gengsheng,Yue Hong.Gas reservoir types and effective fracture-vug distribution laws of Lower Permian series in the southwest area of Sichuan Basin[J].Natural Gas Industry,1995,15(6):10-13.

[31] 颜其彬，庞雯.川南茅口灰岩岩溶特征与油气关系[J].西南石油学院学报,1993,15(3):11-16.

Yan Qibin,Pang Wen.Relationship between oil/gas accumulation and karst features of Maokou Formation in Luzhou area,Sichuan[J].Journal of Southwestern Petroleum Institute,1993,15(3):11-16.

[32] 陆正元.四川盆地下二叠统高自然伽马溶洞储层[J].石油学报，1999，20（5）:24-26.

Lu Zhengyuan.High GR ray karsts reservoir of Low Permian in Sichuan Basin[J].Acta Petrolei Sinica，1999，20（5）:24-26.

[33] 曹刚，李其荣，安辉.川南地区下二叠统茅口组“岩溶型气藏”地震、地质特征探讨[J].天然气地球科学，1999，10（3/4）：76-82.

Cao Gang，Li Qirong，An Hui.“Karst reservoir” seismic and geological character of Maokou Formation of Low Permian in south Sichuan area[J].Natural Gas Geoscience，1999，10（3/4）：76-82.

[34] 苏中堂.鄂尔多斯盆地塔巴庙地区奥陶系马家沟组沉积相与古岩溶储层特征[D].成都：成都理工大学，2008.

Su Zhongtang.Sedimentary facies and charaeter of palaeo-karst reservoir in Majiagou Formation of Ordovician in Tabamiao area,Ordos Basin[D].Chengdu:Chengdu University of Technology,2008.

[35] 张宝民，刘静江.中国岩溶储集层分类与特征及相关的理论问题[J].石油勘探与开发，2009，36(1):12-29.

Zhang Baomin，Liu Jingjiang.Classification and characteristics of karst reservoirs in China and related theories[J].Petroleum Exploration and Development，2009，36(1):12-29.

[36] 陈学时，易万霞，卢文忠.中国油气田古岩溶与油气储层[J].沉积学报，2004，22（2）：244-253.

Chen Xueshi，Yi Wanxia，Lu Wenzhong.The Paleokarst reservoirs of oil/gas fields in China[J].Acta Sedimentologica Sinica，2004，22（2）：244-253.

[37] 黄籍中.四川盆地阳新灰岩生油气问题探讨[J].石油学报,1984,5(1):9-18.

Huang Jizhong.On the occurrence of oil and gas in the Yangxin limestone series in Sichuan Basin[J].Acta Petrolei Sinica,1984,5(1):9-18.

[38] 黄第藩，王兰生.川西北矿山梁地区沥青脉地球化学特征及其意义[J].石油学报,2008,29(1):23-28.

Huang Difan,Wang Lansheng.Geochemical characteristics of bituminous dike in Kuangshanliang area of the northwestern Sichuan Basin and its significance[J].Acta Petrolei Sinica,2008,29(1):23-28.

[39] 朱光有，张水昌，梁英波，等.四川盆地天然气特征及气源[J].地学前缘,2006,13(2):234-248.

Zhu Guangyou,Zhang Shuichang,Liang Yingbo,et al.The characteristics of natural gas in Sichuan Basin and its sources[J].Earth Science Frontiers,2006,13(2):234-248.

[40] 黄籍中，陈盛吉，宋家荣，等.四川盆地烃源体系与大中型气田形成[J].中国科学（D辑）,1996,26(6):504-510.

Huang Jizhong,Chen Shengji,Song Jiarong,et al.Hydrocarbon source systems and formation of gas fields in Sichuan Basin[J].Science in China（Series D）,1997,40(1):32-42.

[41] 黄籍中，张子枢.四川盆地阳新统天然气的成因[J].石油勘探与开发，1982，9(1)：12-25.

Huang Jizhong,Zhang Zishu.Origin of natural gas in the Yangxin limestone(Lower Permian) of Sichuan Basin[J].Petroleum Exploration and Development,1982,9(1):12-25.

[42] 戴金星.四川盆地阳新统气藏的气源主要是煤成气--与黄籍中等同志商榷[J].石油勘探与开发，1983，10(4)：69-75.

Dai Jinxing.Gas in Yang-Xin Formation in Sichuan province is originated from coal containing formation:a discussion on this problem with Mr.Huang et al[J].Petroleum Exploration and Development ,1983，10(4)：69-75.

Paleokarst landform of the weathering crust of Middle Permian Maokou Formation in Sichuan Basin and selection of exploration regions

四川盆地茅口组风化壳岩溶古地貌及勘探选区

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[11]	You Xincai, Chen Mengna, Li Shubo, Liu Chaowei, Li Zonghao, Li Hui, Huang Zhiqiang, Yuan Yunfeng, Wang Qiuyu. Hydrocarbon accumulation conditions and exploration prospects of Santai area in Junggar Basin [J]. Acta Petrolei Sinica, 2023, 44(10): 1650-1662.
[12]	Guo Xusheng, Wei Zhihong, Wei Xiangfeng, Liu Zhujiang, Chen Chao, Wang Daojun. Enrichment conditions and exploration direction of Jurassic continental shale oil and gas in Sichuan Basin [J]. Acta Petrolei Sinica, 2023, 44(1): 14-27.
[13]	Jiang Pengfei, Wu Jianfa, Zhu Yiqing, Zhang Dekuang, Wu Wei, Zhang Rui, Wu Zhe, Wang Qing, Yang Yuran, Yang Xue, Wu Qiuzi, Chen Liqing, He Yifan, Zhang Juan. Enrichment conditions and favorable areas for exploration and development of marine shale gas in Sichuan Basin [J]. Acta Petrolei Sinica, 2023, 44(1): 91-109.
[14]	He Wenyuan, Meng Qi'an, Bai Xuefeng, Wang Xiandong, Wang Youzhi, Tan Wanchang. Evolution and exploration direction of Permian-Triassic multiphase platform margin in northeast Sichuan Basin [J]. Acta Petrolei Sinica, 2022, 43(9): 1201-1212,1235.
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