岩性油气藏 ›› 2016, Vol. 28 ›› Issue (4): 5966.doi: 10.3969/j.issn.1673-8926.2016.04.008
汪洋1,2,李树同1,牟炜卫1,2,闫灿灿1
Wang Yang 1,2,Li Shutong 1,Mou Weiwei 1,2,Yan Cancan 1
摘要:
储层孔隙度演化分析是恢复储层致密化过程、明确储层致密化原因的有效手段。利用钻井岩心、铸体薄片、扫描电镜和粒度分析等资料,在查明鄂尔多斯盆地姬塬西部地区长81 致密储层特征的基础上,定量分析了其孔隙度演化过程。姬塬西部地区长81 储层岩性以细粒岩屑长石砂岩和长石岩屑砂岩为主,储集空间以粒间孔、长石溶孔为主,孔隙结构较差,属于典型的低孔、低渗透致密储层。以薄片观察为基础,采用计点统计的方法恢复了成岩作用过程中孔隙度的演化,并定量求取了各成岩作用对孔隙度演化的贡献值。结果表明:姬塬西部地区长81 储层砂岩初始孔隙度为41.35%,进入埋藏成岩阶段后,压实作用导致了孔隙度的不可逆降低,造成的孔隙度损失率为57.10%,胶结、交代作用造成的孔隙度损失率为32.55%,而后期溶蚀作用带来的孔隙度增加率为6.48%,微裂缝作用带来的孔隙度增加率为0.15%。计算所得长81 储层砂岩孔隙度为7.02%,而实测孔隙度为7.12%,相对误差为1.40%,在合理范围之内。在姬塬西部地区,压实作用和胶结作用造成的长81 储层初始孔隙度损失率高达89.65%,因此,强压实、强胶结作用是导致该区长81 储层致密化的主要原因。
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