沉积相控制下致密砂岩气藏分布特征——以四川盆地川西坳陷中段蓬莱镇组为例

发布时间：2018-02-25 20:01

本文关键词： 沉积相致密砂岩气侏罗系成都凹陷川西坳陷　出处：《石油与天然气地质》2017年03期 　论文类型：期刊论文

【摘要】：针对致密砂岩气藏受沉积相影响控制作用不明晰的情况,综合利用野外露头、岩心分析化验、测井和地震等资料,对川西坳陷中段蓬莱镇组沉积相进行了深入研究,最后探讨了沉积相对致密砂岩气藏的控制作用。研究表明:蓬莱镇组可以划分为2个长期、4个中期及29个短期旋回;蓬莱镇组沉积体主要受来自北西部的龙门山短轴物源控制为主,东部长轴物源次之;从龙门山前至成都凹陷区依次发育冲积扇、冲积平原、辫状河三角洲和湖泊相等沉积体系,东部主要为一套河流相沉积体系;蓬莱镇组含气砂体主要分布在西部三角洲平原、前缘(水下)分流河道、河口坝砂体和东部的河道边滩和心滩砂体中,呈不连续条带状分布;有利的含气圈闭主要受砂体叠置关系与构造或斜坡背景联合控制。
[Abstract]:In view of the fact that the controlling effect of sedimentary facies on tight sandstone gas reservoir is not clear, the sedimentary facies of Penglai Zhen formation in the middle segment of western Sichuan depression are studied by comprehensive use of field outcrop, core analysis, logging and seismic data. Finally, the controlling effect of sedimentary tight sandstone gas reservoir is discussed. The results show that Penglai Zhen formation can be divided into 2 long term, 4 medium and 29 short term cycles. The sedimentary body of Penglai Zhen formation is mainly controlled by Longmen Mountain short axis provenance from the north and west, followed by the long axis provenance in the east, and the alluvial fan, alluvial plain, braided river delta and lacustrine sedimentary system are developed successively from the front of Longmen Mountain to Chengdu depression. In the eastern part, there is mainly a fluvial sedimentary system, and the gas-bearing sand bodies of Penglai Zhen formation are mainly distributed in the western delta plain, the front (underwater) distributary channel, the estuarine bar sand body and the channel banks and core beach sandbodies in the east, showing a discontinuous strip distribution. The favorable gas-bearing traps are mainly controlled by the sandbody overlay and the tectonic or slope background.
【作者单位】：长江大学录井技术与工程研究院;中国石化西南油气分公司勘探开发研究院;
【基金】：国家科技重大专项(2017ZX05008006-004-002) 油气资源与探测国家重点实验室开放基金项目(PRP/open-1510)
【分类号】：P618.13

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