元坝气田长兴组—飞仙关组礁滩相储层特征和形成机理

doi:10.7623/syxb201406001

石油学报 ›› 2014, Vol. 35 ›› Issue (6): 1001-1011.DOI: 10.7623/syxb201406001

• 地质勘探 • 下一篇

元坝气田长兴组—飞仙关组礁滩相储层特征和形成机理

马永生, 蔡勋育, 赵培荣

中国石油化工股份有限公司北京 100728

收稿日期:2014-08-08 修回日期:2014-09-12 出版日期:2014-11-25 发布日期:2014-10-13
通讯作者: 马永生,男,1961年9月生,1984年获武汉地质学院学士学位,1990年获中国地质科学院博士学位,现为中国工程院院士、中国石油化工股份有限公司教授级高级工程师,主要从事储层沉积学与油气勘探研究工作。Email:yongshma@126.com
作者简介:马永生,男,1961年9月生,1984年获武汉地质学院学士学位,1990年获中国地质科学院博士学位,现为中国工程院院士、中国石油化工股份有限公司教授级高级工程师,主要从事储层沉积学与油气勘探研究工作。Email:yongshma@126.com
基金资助:
中国地质调查局项目(资[2012]02-029-006)资助。

Characteristics and formation mechanisms of reef-shoal carbonate reservoirs of Changxing-Feixianguan formations, Yuanba gas field

Ma Yongsheng, Cai Xunyu, Zhao Peirong

China Petroleum & Chemical Corporation, Beijing 100728, China

Received:2014-08-08 Revised:2014-09-12 Online:2014-11-25 Published:2014-10-13

摘要/Abstract

摘要：

借鉴普光气田勘探发现的成功经验,2006年中国石油化工股份有限公司在川东北巴中地区钻探以长兴组—飞仙关组生物礁、滩岩性圈闭为目标的元坝1井,获得50.3×10⁴m³/d高产工业气流,发现了元坝气田。元坝气田为常压高含硫化氢岩性气藏,具有构造变形弱、整体埋藏深的特点,气藏中部平均埋深6 600 m,是四川盆地埋藏最深的海相气田。元坝气田以长兴组礁滩储层为主,其规模大、储集性良好,储层的形成主要受早期大气淡水溶蚀、白云石化作用控制,深埋溶蚀、构造作用影响相对较弱。对元坝、普光等气田深层礁滩相储层特征进行对比,探讨其储层形成机理,认为早期沉积-成岩环境控制了储层的规模与早期孔隙发育,构造-流体耦合控制了裂缝与溶蚀,流体-岩石相互作用控制了孔隙的保存与改造。

关键词: 元坝气田, 普光气田, 上二叠统, 下三叠统, 礁滩, 超深层, 碳酸盐岩储层

Abstract:

According to successful exploration experience in Puguang gas field, the China Petroleum and Chemical Corporation(Sinopec) successfully drilled Well YB1 in 2006 by targeting biogenic reef and shoal lithologic shoal in the Feixianguan-Changxing Formation in the Bazhong area, northeastern Sichuan Basin, China. The Well YB1 produced a high-yield industrial gas flow of 503 000 m³/day, representing the discovery of Yuanba gas field. This new gas field mainly comprises of normal-pressure, high-H₂S lithologic gas reservoirs characterized by weak tectonic deformation and overall deep depth. The mean depth is approximately 6600 m in the central part of the reservoirs, representing the deepest marine reservoirs discovered in Sichuan Basin to date. Dominant reef-shoal reservoirs of the Changxing Formation are widely distributed with high porosity and permeability, whose formation were mainly controlled by early meteoric dissolution and dolomitization associated with weak burial dissolution and tectonic action. The characteristics of deep reef-shoal reservoirs in Yuanba and Puguang gas fields are compared to explore their formation mechanisms. Evidence shows that: (1) Early depositional and diagenetic environment controlled reservoir scale and early pore formation; (2) The coupling of tectonics with fluid activities regulated fracturing and dissolution; and (3) fluid-rock interactions determined the transformation and preservation of pores.

Key words: Yuanba gas field, Puguang gas field, Upper Permian, Lower Triassic, reef-shoal facies, ultra-deep formation, carbonate reservoir

中图分类号:

TE112.2

马永生, 蔡勋育, 赵培荣. 元坝气田长兴组—飞仙关组礁滩相储层特征和形成机理[J]. 石油学报, 2014, 35(6): 1001-1011.

Ma Yongsheng, Cai Xunyu, Zhao Peirong. Characteristics and formation mechanisms of reef-shoal carbonate reservoirs of Changxing-Feixianguan formations, Yuanba gas field[J]. ACTA PETROLEI SINICA, 2014, 35(6): 1001-1011.

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元坝气田长兴组—飞仙关组礁滩相储层特征和形成机理

Characteristics and formation mechanisms of reef-shoal carbonate reservoirs of Changxing-Feixianguan formations, Yuanba gas field

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