川西北二叠系栖霞组白云岩储层结构的井筒高精度刻画——以矿2井为例  

High-resolution Characterization of Borehole-scaled Reservoir Structure:A Case of Lower Permian Qixia Dolostone Reservoir in Well Kuang-2, Northwest of Sichuan Basin

作　　者：杨柳[1,2] 谷明峰[1,2] 杨迅[3] 厚刚福[1,2] 姚倩颖 

机构地区：[1]中国石油杭州地质研究院 [2]中国石油天然气集团公司碳酸盐岩储层重点实验室 [3]中国石油西南油气田公司川西北气矿

出　　处：《海相油气地质》2015年第4期65-72,共8页Marine Origin Petroleum Geology

基　　金：国家油气重大专项"大型油气田及煤层气开发"(2011ZX05004-002)资助

摘　　要：以川西北地区矿2井为例,对井筒尺度的储层结构进行了高精度刻画。以成像测井为主要手段,在地质标定的基础之上,建立了川西北栖霞组白云岩储层的标准剖面,有效识别出主要的5种岩石类型(生物碎屑灰岩、"豹斑"白云质灰岩、块状中—粗晶白云岩、斑状中—粗晶白云岩和角砾状白云岩)和4种储集空间类型(溶蚀孔洞、晶间孔、扩溶缝和构造缝)。研究表明川西北栖霞组白云岩发育多重孔隙系统,其中,溶蚀孔洞是最主要的储集空间类型,普遍呈层状或准层状,发育于块状中—粗晶白云岩中,共1层厚39.5 m;晶间孔是次一级的储集空间类型,发育于斑状中—粗晶白云岩中,共4个薄层,平均厚1.1 m;另外两种储集空间类型(扩溶缝和构造缝)零星发育,对储集性能的贡献不大。块状中—粗晶白云岩发育于三级层序高位域,斑状中—粗晶白云岩仅发育于高位域中四级层序向上变浅旋回的顶部。Depending on the data of high-resolution image log and the geological calibration of dolostone core samples from Well Kuang-2 in the northwest of Sichuan Basin,a typical profile of Lower Permian Qixia dolostone reservoir structure is characterized,by which five types of dolostone and limestone and four types of effective reservoir spaces can be identified.It is shown that multiple pore system develops in Qixia dolostone,in which solution pores and intercrystal pores are contributive commonly.The solution pores appear as layers or quasi-layers in massive medium-and coarse-graine d dolostone (in one strata unit with the thickness of 39.5m) and the intercrystal pores exist in porphyritic medium- and coarse-grained dolostone (in 4 strata units with the average thickness of 1.1m).Other two types of reservoir space,including solution-enlarging fractures and late structural fractures are less contributive.The massive dolostone develops in the HST of the 3rd sequence but the porphyritic dolostone only develops in the upper part of the upward-shallowing cycle of the 4th sequence.

关 键 词：栖霞组 白云岩储层 储层特征 储层描述 成像测井 

分 类 号：TE122.2[石油与天然气工程—油气勘探]