渝东涪陵地区大安寨段页岩储层特征研究
网络出版日期: 2014-04-06
基金资助
国家重大科技专项“四川盆地岩性油气藏富集规律与目标评价”(编号:2011ZX05001-005)资助
Characteristics of shale reservoir of Da’anzhai segment in Fuling area, eastern Chongqing
Online published: 2014-04-06
通过露头剖面观察、钻井岩心描述、薄片鉴定、物性及有机地球化学分析等,对渝东涪陵地区大安寨 段页岩储层特征进行了综合研究。 结果表明,大安寨段页岩优质储层主要发育于半深湖—深湖亚相,岩 石类型以页岩、粉砂质页岩、(含)生物碎屑页岩和钙质页岩为主;页岩储层原生孔隙在成岩作用过程中经 压实、压溶和胶结作用后基本消失,但燕山晚期—喜山期发生的构造变形和破裂作用使其形成了一定数 量的裂缝;成岩作用后期沿裂缝发育的溶蚀孔、洞和缝构成了页岩储层重要的储集空间和渗流通道,极大 地改善了页岩储层的储集性能,属于典型的特低孔、低渗裂缝型储层;储层的分布主要受沉积相与裂缝发 育程度的控制,半深湖—深湖亚相中富含有机质的厚层页岩为页岩气(油)的有利储层。
王珂 , 戴俊生 , 贾开富 , 刘海磊 . 渝东涪陵地区大安寨段页岩储层特征研究[J]. 岩性油气藏, 2014 , 26(2) : 67 -73 . DOI: 10.3969/j.issn.1673-8926.2014.02.011
Based on outcrop observation, drilling core description, physical properties and organic geochemical analysis, this paper studied the shale reservoir characteristics of Da’anzhai segment in Fuling area. The results show that high quality shale reservoirs of Da’anzhai segment are mainly developed in the semi-deep lake-deep lake phase, and the shale rock types include shale, silty shale, (inclusive) bioclastic shale and calcareous shale. Primary pores in shale reservoir disappeared after the diagenesis of compaction, cementation and solution, but the tectonic deformation and fracturing in late Yanshan-Himalayan formed a certain number of cracks. The dissolved pores and holes developed along fractures in the late diagenetic stage constitute important reservoir space and seepage channel space of shale reservoirs, and greatly improved the reservoir properties. The shale reservoir in the study area belongs to typical ultralow porosity and low permeability fractured reservoirs. The reservoir distribution is mainly controlled by sedimentary facies and fracture extent. The thick shale rich in organic matter in semi-deep lake-deep lake phase is favorable reservoir for shale gas resources.
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