川北地区灯影组四段优质储层特征及控制因素

doi:10.12108/yxyqc.20190205

岩性油气藏 ›› 2019, Vol. 31 ›› Issue (2): 35–45.doi: 10.12108/yxyqc.20190205

川北地区灯影组四段优质储层特征及控制因素

王良军

中国石化勘探分公司, 成都 610041

收稿日期:2018-09-28 修回日期:2019-01-04 出版日期:2019-03-21 发布日期:2019-03-21
第一作者:王良军(1972-),男,硕士,高级工程师,主要从事油气地质综合研究与勘探目标评价方面的研究工作。地址:(610041)四川省成都市高新区吉泰路688号中石化西南科研办公基地1115室。Email:wljaa163@163.com。
基金资助:
国家重大科技专项“南方海相碳酸盐岩大中型油气田分布规律及勘探评价”（编号：2017ZX05005-003）和中国石化重大科技项目“四川盆地海相大型气田目标评价与勘探关键技术”（编号：P16082）联合资助

Characteristics and controlling factors of high-quality reservoirs of the fourth member of Dengying Formation in northern Sichuan Basin

WANG Liangjun

Sinopec Exploration Company, Chengdu 610041, China

Received:2018-09-28 Revised:2019-01-04 Online:2019-03-21 Published:2019-03-21

摘要/Abstract

摘要： 为了解决川北地区震旦系灯影组四段储层特征和控制因素认识不清的问题，基于四川盆地北缘露头剖面及岩心观测，通过薄片鉴定、扫描电镜、包裹体、阴极发光、储层物性等研究，分析了灯四段储层岩石学、储集空间、成岩作用及物性等特征，并利用地震资料恢复古地貌，探讨了优质储层发育的控制因素。结果表明：川北地区灯四段储层的岩石类型以颗粒粘连白云岩、藻叠层白云岩及粉-细晶白云岩为主，储集空间以藻黏结格架孔、晶间溶孔及近顺层溶蚀孔洞为主，储层总体具有低孔、低渗特征，但局部地区仍具有发育中孔、中高渗优质储层的条件。受裂陷槽边缘古地貌高地控制发育的台缘丘滩、台内丘滩相带是优质储层发育的物质基础，在中-深埋藏阶段与烃源岩热演化有关的埋藏溶蚀作用是控制灯四段储层大量溶蚀孔洞发育的关键，而表生岩溶作用的影响较弱。优质储层位于绵阳-长宁裂陷槽东缘的元坝西-阆中区块，为台缘丘滩与埋藏溶蚀作用叠加部位，它是川北地区灯四段油气勘探的有利区带。

关键词: 白云岩, 储层特征, 控制因素, 灯影组, 川北地区

Abstract: To clear the characteristics and main controlling factors of Dengying Formation reservoir in northern Sichuan Basin,field outcrops and drilling core observation,rock thin-film identification,scanning electron microscopy,inclusion,cathodoluminescence,reservoir physical property testing were used to analyze the characteristics of petrology,reservoir space,diagenesis and physical properties,seismic data were used to recover the ancient geomorphology,and then the main controlling factors of the reservoir were discussed. The results show that the reservoir rocks are mainly composed of particle-bonded dolomite,algal stromatolitic dolomite and silty-fine dolomite. The reservoir space is dominated by algae-bonded lattice pores,intercrystalline dissolved pores and nearlayered dissolved pores. The reservoir generally has the characteristics of low porosity and low permeability,but high-quality reservoirs with medium pore and high permeability are developed in some areas. The platform marginal mounds and platform inner mounds facies controlled by paleo-geomorphic highlands on the edge of the rift trough are the basis for the development of high-quality reservoirs. Buried dissolution associated with thermal evolution of source rocks in the middle-deep burial stage is the key to controlling the development of a large number of dissolved pores in the fourth member of Dengying Formation. Whereas,the epigenetic karst has a weaker impact on the reservoir. High-quality reservoirs are developed in the western Yuanba to Langzhong block in the eastern margin of Mianyang-Changning rift trough,which is the superimposed favorable area for the marginal mounds facies and burial dissolution. It is a favorable gas exploration zone in northern Sichuan Basin.

Key words: dolomites, reservoir characteristics, controlling factors, Dengying Formation, northern Sichuan Basin

中图分类号:

TE122.2

王良军. 川北地区灯影组四段优质储层特征及控制因素[J]. 岩性油气藏, 2019, 31(2): 35–45.

WANG Liangjun. Characteristics and controlling factors of high-quality reservoirs of the fourth member of Dengying Formation in northern Sichuan Basin[J]. Lithologic Reservoirs, 2019, 31(2): 35–45.

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川北地区灯影组四段优质储层特征及控制因素

Characteristics and controlling factors of high-quality reservoirs of the fourth member of Dengying Formation in northern Sichuan Basin

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