天然气地质学

文昌A凹陷古近系低渗凝析气藏成藏特征与成藏模式

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  • 中海石油(中国)有限公司湛江分公司研究院,广东 湛江 524057
甘军(1971-),男,湖北蕲春人,高级工程师,硕士,主要从事油气勘探综合地质研究. E-mail:ganj@cnooc.com.cn.

收稿日期: 2012-05-28

  修回日期: 2012-07-17

  网络出版日期: 2012-12-10

基金资助

国家重大专项项目“23”课题1“中国近海富生烃凹陷再评价与新领域勘探方向研究成果”(编号:2011ZX05023-001-07)资助.

Reservoir-forming Characteristic and Model of the Palaeogene Condensate Gas Reservoir with Low Permeability in Wenchang A Sag

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  • Research Institute of Zhanjiang Company,CNOOC Ltd.,Zhanjiang 524057,China

Received date: 2012-05-28

  Revised date: 2012-07-17

  Online published: 2012-12-10

摘要

低渗凝析气藏的成藏机理是影响文昌A凹陷天然气勘探开发成效的关键问题。运用烃源岩地球化学、储层沉积学和成藏综合分析等方法,对天然气地质条件、气藏特征及成藏动态过程进行系统研究。得出如下新认识:①研究区下渐新统恩平组一段厚层湖沼相、滨浅湖相泥岩是主要的优质气源岩,该套烃源岩分别与恩平组二段、珠海组发育的(扇)三角洲相、潮坪相储层形成 “自生自储” 和“下生上储”2套成藏组合;②恩平组、珠海组储层埋深大于3 500m,孔隙度小于12%,渗透率小于1×10-3μm,沉积微相和成岩作用控制了“甜点”储层的分布;③恩平组、珠海组储层“先致密、后成藏”致使油气的运移距离较短,具备“近源运移、晚期成藏”的特征。根据上述新认识提出2种成藏模式,即陡坡带垂向运聚模式和缓坡带垂向+侧向运聚模式,并指出北部缓坡带是下一步新领域拓展勘探的重要方向。

本文引用格式

甘军,张迎朝,邓志勇,杨金海,邓广君,郑榕芬,李才 . 文昌A凹陷古近系低渗凝析气藏成藏特征与成藏模式[J]. 天然气地球科学, 2012 , 23(6) : 1060 -1069 . DOI: 10.11764/j.issn.1672-1926.2012.06.1060

Abstract

Reservoir-formation mechanism of the Palaeogene condensate gas reservoir with low permeability in Wenchang A sag is a key issue which affects the exploration and development of natural gases.Based on the application of source geochemistry,reservoir sedimentology and reservoir comprehensive analysis,a systematic study has been carried out on the geological condition of reservoir-formation,reservoir-formation feature and dynamic reservoir-formation process.Following three conclusions have been achieved:(1)Wenchang lacustrine mud and Enping swamp carbonaceous mud form two-layer high quality source rocks;(2)Oligocene fluvial and delta sediments of Enping and Zhuhai Formations are major reservoirs,which have the characteristics of great burial depth (>3 500m),POR<12%,PERM<1×10-3μ m2.Distribution of “sweet spot” is controlled by sedimentary micro-facies and diagenesis;(3)The early compaction and late accumulation of the Enping and Zhuhai reservoirs resulted in the short migration distance of oil-gas,hence it demonstrates the characteristics of short migration and late accumulation.According to these new cognitions,we bring forward two reservoir-forming patterns: vertical migration at the steep slope and the vertical and lateral migration at the gentle slope.It is indicated that the north gentle slope is a favorable exploration trend.

参考文献

[1]Lin Xingrong,Sun Zhipeng.Natural gas accumulation condition of Wenchang A sag[J].Narural Gas Industry,1999,19(1):47-51.[林兴荣,孙志鹏.文昌A凹陷天然气成藏条件[J].天然气工业,1999,19(1):47-51.]



[2]Ji Hongquan,Wang Xinhai.The potential of oil and gas exploration in Wenchang A sag of the Pearl River Mouth basin[J].Natural Gas Geosciences,2004,15(3):238-242.[季洪泉,王新海.珠江口盆地文昌A凹陷油气勘探潜力分析与预测[J].天然气地球科学,2004,15(3):238-242.]



[3]Gong Zaisheng,Li Sitian,Xie Taijun,et al .Continental Margin Basin Analysis and Hydrocarbon Accumulation of the Northern of South China Sea[M].Beijing:Scicence Press,1997:65-74.[龚再升,李思田,谢泰俊,等.南海北部大陆边缘盆地分析与油气聚集[M].北京:科学出版社,1997:65-74.]



[4]Gong Zaisheng,Li Sitian.Hydrocarbon Accumulation Dynamics Research of Continental Margin Basins in the North of South China Sea[M].Beijing:Scicence Press,2004:289-298.[龚再升,李思田.南海北部大陆边缘盆地油气成藏动力学研究[M].北京:科学出版社,2004:289-298.]



[5]Zhu Weilin,Li Mingbi,Wu Peikang.Petroleum system in Zhu-Ⅲ depression of Pearl River Mouth basin[J].Petroleum Exploration and Development,1997,24(6):21-26.[朱伟林,黎明碧,吴培康.珠江口盆地珠三坳陷石油体系[J].石油勘探与开发,1997,24(6):21-26.]



[6]Lü Xueju,Xiao Li,Lin Zhengliang,et al .Analysis of subsidence history of Zhu-Ⅲ depression in western  Pearl River Mouth basin[J].Xinjiang Petroleum Geology,2008,29(2):195-197.[吕学菊,肖力,林正良,等.珠江口盆地西部珠三坳陷沉降史分析[J].新疆石油地质,2008,29(2):195-197.]



[7]Wang Jinqi.Theorically predicting the super large-sized deep basin gas region in E'erduosi basin three times and its prospects[J].Narural Gas Industry,2003,23(3):1-4.[王金琪.鄂尔多斯超大型深盆气区三次理论预测及今后展望[J].天然气工业,2003,23(3):1-4.]



[8]Minqi,Yanghua,Fu Jinhua.Deep basin gas in E'erduosi basin[J].Narural Gas Industry,2000,20(6):11-15.[闵琪,杨华,付金华.鄂尔多斯盆地的深盆气[J],天然气工业,2000,20(6):11-15.]



[9]Masters J A.Deep basin gas traps western Canada[J].AAPG Bulletin,1979,63(2):152-181.



[10]Li Zhongdong,Hao Shuming,Li Liang,et al .Comparison between the upper Paleozioc gas reservoirs in Ordos basin and deep basin gas reservoirs[J].Oil and Gas Geology,2009,30(2):149-155.[李仲东,郝蜀民,李良,等.鄂尔多斯盆地上古生界气藏与深盆气藏特征对比[J].石油与天然气地质,2009,30(2):149-155.]



[11]Wang Chuangang,Gao Li,Xu Huazheng,et al .Forming mechanism and evolution stages division of deep basin gas accumulation:Taking Ordos basin as an example[J].Natural Gas Geoscience,2011,22(1):15-22.[王传刚,高莉,许化政,等.深盆气形成机理与成藏阶段划分——以鄂尔多斯盆地为例[J].天然气地球科学,2011,22(1):15-22.]



[12]Hao Guoli,Liu Guangdi,Xie Zengye,et al .Gas-water distributed pattern in Xujiahe Formation tight gas sandstone reservoir and influential factor in central Sichuan basin[J].Natural Gas Geoscience,2010,21(3):427-434.[郝国丽,柳广弟,谢增业,等.川中地区须家河组致密砂岩气藏气水分布模式及影响因素分析[J].天然气地球科学,2010,21(3):427-434.]



[13]Yang Hua,Liu Xinshe,Meng Peilong.New development in natural gas exploration of the Sulige gas fields[J].Narural Gas Industry,2011,31(2):1-8.[杨华,刘新社,孟培龙.苏里格地区天然气勘探新进展[J].天然气工业,2011,31(2):1-8.]



[14]Guo Qiulin,Chen Ningsheng,Hu Junwen,et al .Geo-model of tight sandstone gas accumulation and Quantitative simulation[J].Natural Gas Geoscience,2012,23(2):199-207.[郭秋麟,陈宁生,胡俊文,等.致密砂岩气聚集模型与定量模拟探讨[J].天然气地球科学,2012,23(2):199-207.]

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