石油与天然气地质 ›› 2022, Vol. 43 ›› Issue (6): 1413-1430.doi: 10.11743/ogg20220611
范建平1(), 宋金民1(), 江青春2, 刘树根1,3, 叶玥豪1, 黄士鹏2, 王佳蕊1, 苏旺2, 李立基1, 金鑫1, 冯宇翔1
收稿日期:
2022-06-06
修回日期:
2022-08-18
出版日期:
2022-11-21
发布日期:
2022-11-21
通讯作者:
宋金民
E-mail:272595210@qq.com;songjinmin@sohu.com
第一作者简介:
范建平(1997—),男,硕士研究生,地质资源与地质工程。E?mail: 基金项目:
Jianping Fan1(), Jinmin Song1(), Qingchun Jiang2, Shugen Liu1,3, Yuehao Ye1, Shipeng Huang2, Jiarui Wang1, Wang Su2, Liji Li1, Xin Jin1, Yuxiang Feng1
Received:
2022-06-06
Revised:
2022-08-18
Online:
2022-11-21
Published:
2022-11-21
Contact:
Jinmin Song
E-mail:272595210@qq.com;songjinmin@sohu.com
摘要:
川东地区中二叠统茅口组一段(茅一段)非常规泥质灰岩储层近期取得重大勘探发现。基于野外露头剖面及钻井岩心观察,通过薄片鉴定、物性分析、X射线衍射、氮气吸附、氩离子抛光扫描电镜、总有机碳含量(TOC)测定、CT扫描以及测井分析等手段,对茅一段泥质灰岩储层及其主控因素进行研究。结果表明,川东地区茅一段主要发育泥晶灰岩、泥晶生屑灰岩、生屑泥晶灰岩和(含)泥质生屑泥晶灰岩等4种岩石类型以及粒缘孔(缝)、有机质孔、溶孔(缝)、裂缝、滑石收缩孔(缝)等5类储集空间。其中,泥晶灰岩和泥晶生屑灰岩孔隙度低,有机质含量低,储集性能差;生屑泥晶灰岩和(含)泥质生屑泥晶灰岩孔隙度高,有机质含量高,储集性能好。茅一段储层受岩相、有机质丰度和成岩作用的综合控制,生屑泥晶灰岩微相和(含)泥质生屑泥晶灰岩微相中的原始孔隙发育好且富含粘土矿物;粘土矿物转化形成的粘土微孔和有机质孔为茅一段主要的储集空间;白云石化作用和溶蚀作用为茅一段提供了部分储集空间。基于此,提出茅一段优质储层发育模式:沉积期,由于原始组构差异,生屑泥晶灰岩和(含)泥质生屑泥晶灰岩中的原始孔隙发育;中-深埋藏期,海泡石发生成岩转化,形成粘土微孔和有机质孔,同时释放富镁成岩流体,发生白云石化;深埋藏期,酸性流体进一步改造储层,使生屑泥晶灰岩和(含)泥质生屑灰岩储层发育为优质储层。
中图分类号:
图2
川东地区茅一段岩石结构类型照片a. Z8井,埋深4 565.78 m,泥晶灰岩,岩心;b. Z8井,埋深4 565.78 m,泥晶灰岩,裂缝被石英充填,单偏光;c. Z8井,埋深4 565.78 m,泥晶灰岩,裂缝,单偏光;d. S6井,埋深4 183.73 m,泥晶生屑灰岩,高角度裂缝,岩心;e. S6井,埋深4 183.73 m,泥晶生屑灰岩,头足、双壳,单偏光;f. S6井,埋深4 180.52 m,泥晶生屑灰岩,单偏光;g. HS4井,埋深2 678.29 m,生屑泥晶灰岩,岩心;h. HS4井,埋深2 678.29 m,生屑泥晶灰岩,生屑呈层状分布,单偏光;i. HS4井,埋深2 678.29 m,生屑泥晶灰岩,溶缝,单偏光;j. HS4井,埋深2 679.79 m,(含)泥质生屑泥晶灰岩,泥质条带,岩心;k. HS4井,埋深2 679.79 m,(含)泥质生屑泥晶灰岩,褐色滑石条带,单偏光;l. HS4井,埋深2 867.37 m,白云石晶间溶孔,单偏光"
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