桂中坳陷泥盆系页岩气成藏条件与有利区带评价

doi:10.11743/ogg20120304

摘要/Abstract

摘要：

桂中坳陷泥盆系经历陆内裂陷演化阶段,沉积了一套台盆-深水陆棚相黑色泥页岩。通过野外典型露头、钻井及地球化学分析等资料,认为桂中坳陷中下泥盆统泥页岩具备形成页岩气的资源基础和优越的成藏条件,其泥页岩厚度大(最大累计厚度可达1 000 m)、有机质丰度高(有机碳含量为0.53%~9.46%)、热演化程度适中(镜质体反射率为1.33%~3.62%)、储层微孔隙-纳米孔及微裂缝发育、粘土矿物成分好、埋深适宜及保存条件相对较好,勘探潜力较大。借鉴北美页岩气勘探开发经验,结合中国南方海相页岩气勘探实际,优选现阶段有利区评价相关指标,认为南丹-忻城-马山一线以西地区为桂中坳陷泥盆系页岩气勘探的有利区带。

关键词: 成藏条件, 有利区带, 泥盆系, 页岩气, 桂中坳陷

Abstract:

A set of dark shales of intraplatform depression-deep shelf facies was deposited in Guizhong depression during the Devonian when the Guizhong depression experienced intracontinental rifting.Outcrop observation and integrated analysis of drilling and geochemical data indicate that the Middle-Lower Devonian shale in Guizhong depression feature in large thickness(the maximum cumulative thickness up to 1 000 m),high abundance of organic matter(TOC of 0.53%~9.46%),moderate thermal maturity(R_o of 1.33%~3.62%),well-developed micro-pores,nono-pores and micro-fractures,favorable clay mineral composition,moderate burial depth,and relatively good sealing conditions.All these characteristics reveal its high potential for shale gas exploration.Based on the shale gas exploration experiences of North American,in combination with the practice of marine shale gas exploration in south China, we put forward evaluation criteria for shale gas play.Paly evaluation results with these criteria show that the area to the west of Nandan-Xincheng-Mashan is a potential play for shale gas exploration in the Devonian in Guizhong depression.

Key words: hydrocarbon accumulation wndition, play, shale gas, Devonian, Guizhong Depression

中图分类号:

TE122.1

王鹏万,陈子炓,贺训云,等. 桂中坳陷泥盆系页岩气成藏条件与有利区带评价[J]. 石油与天然气地质, 2012, 33(3): 353-363. doi: 10.11743/ogg20120304 Wang Pengwan,Chen Ziliao,He Xunyun,et al. Shale gas accumulation conditions and play evaluation of the Devonian in Guizhong Depression[J]. Oil & Gas Geology, 2012, 33(3): 353-363. doi: 10.11743/ogg20120304

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