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川西北部地区上二叠统吴家坪组的地层划分及 有利储集岩分布
Division of strata and distribution of favorable reservoir rocks of the Upper Permian Wujiaping formation in the northwestern Sichuan Basin
曾 琪1 胡 欣1 屈海洲2,3 李泯星2,3 刘茂瑶2,3 李彦锋2,3 张祎蕾1
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作者单位:1. 中国石油西南油气田公司川西北气矿 2. 西南石油大学地球科学与技术学院 3. 中国石油碳酸盐岩储集层重点实验室沉积—成藏研究室
中文关键字:川西北部地区 晚二叠世 吴家坪组 地层划分 储集岩分布 凝灰岩
英文关键字:northwestern Sichuan; Wujiaping formation; stratigraphic classfication; distribution of reservoir rock
中文摘要:   综合野外剖面、岩屑、测井、地震、古生物等资料,厘定了四川盆地西北部地区上二叠统吴家坪组顶、底界线特征,划分出各岩性段,并分析了各段地层分布及有利储集岩的平面展布特征。研究结果表明:①川西北部地区吴家坪组底部发育一套王坡页岩,顶界与上覆地层呈整合接触,从下至上依次划分为三段(吴一段、吴二段、吴三段)。②吴家坪组厚度介于37 ~ 249m,由南西至北东方向先减薄再增厚再减薄,在lg70 井区附近厚度可达249 m。③吴家坪组有利的储集岩主要有颗粒灰岩、白云岩与凝灰岩三大类,颗粒灰岩累计厚度2 ~ 48 m,分布范围主要集中双鱼石—龙岗西一带,往周边逐渐变薄;白云岩累计厚度1 ~25 m,主要分布在双鱼石st12 井- st10 井一带;凝灰岩累计厚度2 ~ 82 m,较厚的区域在sy001-1 井和lg70 井一带,向南西、北东向厚度逐渐减薄。本次研究将对后期遴选有利的油气勘探区域,具有一定指导意义。
英文摘要:    Based on the data of cuttings, logging, field profile, seismic and paleontology, the characteristics of top and bottom boundary of Wujiaping formation in northwestern Sichuan are determined, each lithologic section is divided, and the formation distribution and plane distribution characteristics of favorable reservoir rocks in each section are analyzed.The results show that: ① A set of Wangpo shale is developed at the bottom of Wujiaping formation in the northwestern Sichuan. The top boundary is in comformity contact with the underlying strata, and it is divided into three members from bottom to top: Wu 1 member, Wu 2 member, Wu 3 member. ② The thickness of Wujiaping formation is between 37 m and 249 m. The thickness of Wujiaping formation is thinned - thickened -thinned from southwest to northeast, and the thickness can reach 249 m near the lg70 well area. ③ The favorable reservoir rocks of Wujiaping formation are mainly granular limestone,dolomite and tuff. The cumulative thickness of granular limestone is 2 ~ 48 m,the distribution range is mainly concentrated in the area of Shuangyushi-Longgangxi, and gradually thinned around. Tthe cumulative thickness of dolomite is 1 ~ 25 m, which is mainly distributed in the area of st12-st10. The cumulative thickness of tuff is 2 ~ 82 m.The thicker area of tuff is in the area of sy001-1 and lg70, and the thickness decreases gradually in southwest and northeast direction.The research in this paper will be of certain guiding significance for the selection of favorable oil and gas exploration areas in the later stage.
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国内统一连续出版物号:CN51-1159/TE |国内发行代码: |国际标准出版物号:ISSN1673-3177 |国际发行代码:
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