石油学报 ›› 2021, Vol. 42 ›› Issue (10): 1287-1298.DOI: 10.7623/syxb202110003

• 地质勘探 • 上一篇    下一篇

川东地区开江—梁平海槽南段飞仙关组鲕滩储层特征及主控因素

冯林杰1,2, 蒋裕强1,2, 刘菲3, 谷一凡1,2, 王占磊1,2, 钟克修3, 廖义沙3   

  1. 1. 西南石油大学地球科学与技术学院 四川成都 610500;
    2. 中国石油非常规重点实验室储层评价实验室 四川成都 610500;
    3. 中国石油西南油气田公司重庆气矿 重庆 400021
  • 收稿日期:2020-10-12 修回日期:2021-07-17 出版日期:2021-10-25 发布日期:2021-11-03
  • 通讯作者: 谷一凡,男,1990年10月生,2014年获西南石油大学学士学位,2020年获西南石油大学博士学位,现为西南石油大学师资博士后,主要从事非常规油气地质、储层地质及油气藏开发地质等方面的研究工作。Email:xnsygyf@126.com
  • 作者简介:冯林杰,男,1993年7月生,2019年获西安石油大学矿产普查与勘探专业硕士学位,现为西南石油大学地球科学与技术学院博士研究生,主要从事深层碳酸盐岩、致密油气方面的研究工作。Email:1931930630@qq.com
  • 基金资助:
    国家自然科学基金项目(No.41972165)、国家科技重大专项(2017ZX05008-004-008)资助。

Reservoir characteristics and main controlling factors of oolitic shoal reservoir in Feixianguan Formation in the southern part of Kaijiang-Liangping trough, eastern Sichuan Basin

Feng Linjie1,2, Jiang Yuqiang1,2, Liu Fei3, Gu Yifan1,2, Wang Zhanlei1,2, Zhong Kexiu3, Liao Yisha3   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Sichuan Chengdu 610500, China;
    2. Unconventional Reservoir Evaluation Laboratory, PetroChina Key Laboratory of Unconventional Oil and Gas, Sichuan Chengdu 610500, China;
    3. Chongqing Gas Field, PetroChina Southwest Oil and Gas Field Company, Chongqing 400021, China
  • Received:2020-10-12 Revised:2021-07-17 Online:2021-10-25 Published:2021-11-03

摘要: 开江-梁平海槽中-北段飞仙关组鲕滩气藏勘探已在多个区块取得重大突破,而海槽南段的勘探进展有限,其储层面貌及分布的控制因素不明确。基于录井、岩心、岩石薄片和碳、氧、锶同位素、主量与微量元素等测试资料,根据矿物组成、晶粒大小和孔隙成因类型,在开江-梁平海槽南段飞仙关组鲕滩识别出粒间孔型鲕粒灰岩(A型)、铸模孔型鲕粒灰岩(B型)、粒间溶孔型鲕粒白云岩(C型)、铸模孔型鲕粒白云岩(D型)、细晶白云岩(E型)和粉晶白云岩(F型)6种储集岩类型以及鲕粒灰岩储层、鲕粒白云岩储层和晶粒白云岩储层3类储层。鲕粒灰岩储层分布在台缘带和台内。台缘带鲕粒灰岩储层岩石类型为粒间孔型鲕粒灰岩,储集空间以残留粒间孔为主;台内鲕粒灰岩储层岩石类型为铸模孔型鲕粒灰岩,储集空间主要为铸模孔或粒内溶孔。鲕粒白云岩储层仅发育在台缘带,储集岩类型为粒间溶孔型鲕粒白云岩或粒间溶孔型鲕粒白云岩与铸模孔型鲕粒白云岩的组合。晶粒白云岩储层仅在台缘带发育,储集岩类型为细晶白云岩或粉晶白云岩,储集空间以晶间孔为主。飞仙关组鲕滩储层整体为低孔、低渗,鲕粒白云岩储层与晶粒白云岩储层、细晶白云岩与粒间溶孔型鲕粒白云岩的储集物性相对较好。组构选择性溶蚀作用和同生成岩阶段-早成岩阶段中等盐度海水主导的渗透回流白云石化作用是飞仙关组鲕滩储层与储集岩类型多样化及其分布规律的主要控制因素。

关键词: 储层类型, 主控因素, 开江—梁平海槽, 飞仙关组, 三叠系, 川东地区

Abstract: The exploration of oolitic shoal gas reservoir in from the middle part of Kaijiang-Liangping trough to the northern Feixianguan Formation has made great breakthroughs in many areas, while the exploration progress in the southern part of the trough in eastern Sichuan Basin has been impeded by a unclear understanding of the reservoir landscape and controlling factors of reservoir distribution. Based on the test data of well logging, core, rock thin section, carbon, oxygen and strontium isotopes, and major-trace elements, according to mineral composition, grain size and genetic type of pores, we identified the oolitic limestone with intergranular pores (Type A) and moldic pores (Type B), the oolitic dolostone with intergranular dissolution pores (Type C) and moldic pores (Type D), the fine crystalline dolostone (Type E), and the powder crystalline dolostone (Type F), thus forming three types of reservoirs such as oolitic limestone, oolitic dolostone and crystalline dolostone. Of these, oolitic limestone reservoirs are distributed in the platform and its margin. The oolitic dolostone reservoir in the platform margin belongs to Type A, and the reservoir space is dominated by residual intergranular pores; the intra-platform oolite limestone reservoir belongs to Type B, and the reservoir space is dominated by moldic pores or intragranular dissolved pores. Oolitic dolostone reservoirs are only developed in the platform margin, composed of Type C oolitic dolostone, or a combination of Type C oolitic dolostone and Type D oolitic dolostone. Crystalline dolostone reservoirs are only developed in the platform margin, composed of the fine crystalline dolostone (Type E) or powder crystalline dolostone (Type F), dominated by intercrystalline pores. The oolitic shoal reservoir in Feixianguan Formation is generally characterized by low porosity and permeability. Better physical properties are observed in oolitic dolostone reservoirs, crystalline dolostone reservoirs, fine crystalline dolostones and Type C oolitic dolostone. The fabric-selective dissolution and seepage-reflux dolomitization dominated by comtemporaneous penesaline seawater during syndiagenetic stage and the early stage of diagenesis are main factors controlling the reservoir diversity and reservoir rock types.

Key words: reservoir type, main controlling factors, Kaijiang-Liangping trough, Feixianguan Formation, Triassic, eastern Sichuan Basin

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