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四川盆地元坝地区飞仙关组二段滩相储层孔隙演化特征
刘景东1,2,刘光祥2,韦庆亮2,袁国伟3,4
(1.中国石油大学地球科学与技术学院,山东青岛 266580;2.中国石化石油勘探开发研究院无锡石油地质研究所,江苏无锡214126;3.低渗透油气田勘探开发国家工程实验室,陕西西安 710018;4.中国石油长庆油田分公司勘探开发研究院,陕西西安 710018)
摘要:
通过岩石薄片、阴极发光、电子探针和流体包裹体分析等方法,对元坝地区飞仙关组二段滩相储层发育特征及影响储层孔隙形成、保存的主要成岩作用进行详细研究,并结合烃类充注期次,探讨滩相储层的孔隙演化模式。结果表明:研究区储层以鮞粒灰岩为主,粒间溶孔和粒内溶孔等次生孔隙构成主要的储集空间;储层孔隙的形成受泥晶化、溶蚀、胶结充填、压实压溶、构造破裂等多种成岩作用影响,其中大气淡水溶蚀作用是储层次生孔隙形成的关键,I期埋藏溶蚀作用为烃类充注提供了良好的通道和储集场所,而大气淡水方解石胶结作用则对次生孔隙保存起到明显的破坏作用;研究区储层孔隙演化经历了石油充注前形成溶孔且孔隙增减交替变化、油向气转化期溶孔孔隙减少、油向气转化后形成裂缝、溶孔且孔隙缓慢增加3个阶段。
关键词:  四川盆地  元坝  飞仙关组  碳酸盐岩  台缘滩  储层  孔隙结构
DOI:10.3969/j.issn.1673-5005.2016.01.002
分类号::TE 122.2
基金项目:中央高校基本科研业务费专项(14CX02116A);中国博士后科学基金项目(2013M530848)
Pore evolution characteristics of beach facies reservoir of Feixianguan Ⅱ Member in Yuanba area, Sichuan Basin
LIU Jingdong1,2, LIU Guangxiang2, WEI Qingliang2, YUAN Guowei3,4
(1.School of Geosciences in China University of Petroleum, Qingdao 266580, China;2.Wuxi Research Institute of Petroleum Geology, Research Institute of Petroleum Exploration and Production, SINOPEC, Wuxi 214126, China;3.National Engineering Laboratory of Low Permeability Oil and Gas Exploration and Development, Xi 'an 710018, China;4.Exploration and Development Research Institute, Changqing Oilfield Branch Company, PetroChina, Xi 'an 710018, China)
Abstract:
Using analyses of rock thin sections, cathodoluminescence, electron microprobe and fluid inclusion, the reservoir characteristics and the diagenesis that affected on reservoir pore formation and preservation of the Feixianguan Ⅱ Member in Yuanba area were studied. The pore evolution model was discussed combined with hydrocarbon infill injection period times. The results show that the oolitic limestone with intergranular and intragranular dissolved pores is the main reservoir in the study area. Reservoir pores are mainly formed by micritization, dissolution, cement filling, compaction, pressure solution and tectonic rupture. Meteoric dissolution is the key for secondary porosity formation. The first buried dissolution provides a good channel and gathering place for hydrocarbon filling, but meteoric calcite cement plays a significant role in the destruction of the secondary porosity preservation. There are three stages of reservoir pore evolution in the study area, namely, dissolution pore forming and the alternative variation of pore fluctuating before oil charging; pore decreasing in the transformation period from oil to gas; and fracture and dissolution pore forming and slow pore increasing after transformation from oil to gas.
Key words:  Sichuan Basin  Yuanba area  Feixianguan Formation  carbonate rock  marginal platform beach  reservoir  pore structure
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