鄂尔多斯盆地东部奥陶系风化壳古地貌特征嬗变及地质意义

doi:10.7623/syxb201709002

石油学报 ›› 2017, Vol. 38 ›› Issue (9): 999-1009.DOI: 10.7623/syxb201709002

鄂尔多斯盆地东部奥陶系风化壳古地貌特征嬗变及地质意义

魏新善^1,2, 任军峰^1,2, 赵俊兴³, 张道锋^1,2, 罗顺社⁴, 魏柳斌^1,2, 陈娟萍^1,2

1. 低渗透油气田勘探开发国家工程实验室陕西西安 710018;
2. 中国石油长庆油田公司勘探开发研究院陕西西安 710018;
3. 成都理工大学沉积地质研究院四川成都 610059;
4. 长江大学湖北荆州 434100

收稿日期:2017-01-18 修回日期:2017-07-27 出版日期:2017-09-25 发布日期:2017-10-09
通讯作者: 任军峰,男,1978年11月生,2001年获西北大学学士学位,2004年获得西北大学硕士学位,中国石油长庆油田公司勘探开发研究院高级工程师,长期从事鄂尔多斯盆地碳酸盐岩综合地质研究及勘探生产工作。Email:rjf_cq@petrochina.com.cn
作者简介:魏新善,男,1962年8月生,1983年获西北大学学士学位,1996年获成都理工大学博士学位,现为中国石油长庆油田公司勘探开发研究院高级工程师,长期从事鄂尔多斯盆地天然气勘探生产和综合地质研究工作。Email:wxs_cq@petrochina.com.cn
基金资助:
国家重大科技专项（2016ZX05004-006，2016ZX05050）资助。

Paleo-geomorphologic characteristic evolution and geological significance of the Ordovician weathering crust in eastern Ordos Basin

Wei Xinshan^1,2, Ren Junfeng^1,2, Zhao Junxing³, Zhang Daofeng^1,2, Luo Shunshe⁴, Wei Liubin^1,2, Chen Juanping^1,2

1. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil & Gas Fields, Shaanxi Xi'an 710018, China;
2. Research Institute of Exploration and Development, PetroChina Changqing Oilfield Company, Shaanxi Xi'an 710018, China;
3. Institute of Sedimentary Geology, Chengdu University of Technology, Sichuan Chengdu 610059, China;
4. Yangtze University, Hubei Jingzhou 434100, China

Received:2017-01-18 Revised:2017-07-27 Online:2017-09-25 Published:2017-10-09

摘要/Abstract

摘要：

鄂尔多斯盆地奥陶系风化壳气藏的发育与前石炭纪古地貌格局密切相关，目前主要认为发育西高东低的古地貌格局，自西向东依次发育岩溶高地、岩溶斜坡及岩溶盆地的古地貌单元。但随着勘探的深入，在盆地东部地区奥陶系早期认为的岩溶盆地区已经发现了大量代表了较强岩溶作用的岩溶角砾岩等地质现象，因此有必要从古地貌动态演化角度重新认识影响岩溶古地貌发育的内外因素，研究地质历史中奥陶系风化壳古地貌的性质嬗变，指导对区域储集空间发育规律的进一步研究与预测。以盆地东部奥陶系顶部风化壳古地貌恢复为目的，综合研究了古地理背景、残留地层厚度、古岩溶特征等因素。认为早期在盆地中东部存在一个大范围的岩溶古高地，形成了岩溶型储集空间，但后期盆地东部逐渐演变为古岩溶盆地，形成了现今的前石炭纪古地貌格局，并造成早期形成的溶蚀类储集空间被大量充填，整体储层较致密，但由于溶洞塌陷形成的裂缝网络沟通了白云岩晶间孔储集空间，局部仍然可以保留有较好的储层，是值得重视的勘探目标。

关键词: 鄂尔多斯盆地, 奥陶系, 风化壳, 岩溶储层, 古地貌演化

Abstract:

The development of Ordovician weathering crust gas reservoir in Ordos Basin is closely related with pre-Carboniferous paleo-geomorphology. Currently, it is believed that the paleo-geomorphology is developed high in the west and low in the east, including the paleo-geomorphologic units of karst plateau, karst slope and karst basin from west to east successively. With the further exploration in recent years, a large number of geological phenomena, such as karst breccia with strong karstification, have been found in the identified Early Ordovician karst basin of the eastern basin. Therefore, it is necessary to re-understand the internal and external factors that affect the development of karst paleo-geomorphology through dynamic evolution of paleo-geomorphology, study the paleo-geomorphologic evolution of Ordovician weathering crust in geological history, and guide further research and prediction of the development laws of regional reserving space. To recover the paleo-geomorphology of the Ordovician top weathering crust in the eastern basin, the paleo-geographic background, the thickness of residual strata, the paleo-karst characteristics and other factors are comprehensively considered in this study. It is believed that a large range of karst paleo-highs existed in the central-eastern basin during the early period to form karst reserving space. However, the eastern basin gradually evolved into the paleo-karst basin during the late period to form the current pre-Carboniferous paleo-geomorphology. As a result, the early formed dissolution reserving space was filled massively, thus forming the whole tight reservoir. However, due to the fracture network connection formed by the collapse of karst caves and the reserving space of dolomite inter-crystalline pores, favorable reservoirs can also be preserved locally and become valuable exploration targets.

Key words: Ordos Basin, Ordovician, weathering crust, karst reservoir, evolution of paleo-geomorphology

中图分类号:

TE121

魏新善, 任军峰, 赵俊兴, 张道锋, 罗顺社, 魏柳斌, 陈娟萍. 鄂尔多斯盆地东部奥陶系风化壳古地貌特征嬗变及地质意义[J]. 石油学报, 2017, 38(9): 999-1009.

Wei Xinshan, Ren Junfeng, Zhao Junxing, Zhang Daofeng, Luo Shunshe, Wei Liubin, Chen Juanping. Paleo-geomorphologic characteristic evolution and geological significance of the Ordovician weathering crust in eastern Ordos Basin[J]. Acta Petrolei Sinica, 2017, 38(9): 999-1009.

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鄂尔多斯盆地东部奥陶系风化壳古地貌特征嬗变及地质意义

Paleo-geomorphologic characteristic evolution and geological significance of the Ordovician weathering crust in eastern Ordos Basin

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