川西凹陷浅层气藏分布规律研究——以洛带和新场气田为例
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摘要
川西凹陷浅层气藏由侏罗系蓬莱镇组、遂宁组和沙溪庙组气藏构成。不同地区、不同组段、不同沉积相的砂体含气丰度差异很大,总体产能以三角洲前缘相砂体为最高,洛带和新场气田的产能几乎集中在几套大型的三角洲前缘相砂体。砂体的含气丰度与砂体的沉积相类型、砂体和断层的配置关系有密切联系。针对这一情况,从石油地质条件、砂体与断层的配置关系、沉积相和地震相特征等角度对洛带和新场气田的含气情况进行了分析。认为断层的渗透性、断层的封堵性是浅层气藏形成的关键因素,断层渗透性好、封堵性差的部位和区域,油气容易在上部盖层附近富集;断层渗透性差、封堵性好的部位和区域,油气不易向上运移,易在下部富集。根据这一油气富集模式,对川西凹陷洛带气田的一个三角洲前缘相砂体进行了含油气性预测,部署的D68井获得了15×104 m3／d的测试产量。
The main pay beds include Penglaizheng, Suining and Shaximiao in western Sichuan depression. The most of production in Luodai field and Xinchang field almost are from several prodelta facies sands. The gas saturation of sandstone is closely related to sedimentary facies type and the deployment of fault and sand. This paper analyzes the petroleum geology condition and the relationship between the deployment of fault and sand as well as the sedimentary, seismic facies. It is concluded that the permeability and the sealing ratio of a fault are key factors controlling the distribution of gas field. The gas is more likely to migrate to the upper sand and accumulate in the upper formation if the sealing ratio of faults is low and the permeability is high, otherwise, gas would migrate to the lower sand and accumulate in the lower formation. According to oil and gas accumulation pattern, a gas bearing sand in prodelta facies of Lu- odai field in western Sichuan Depression has been predicted, a disposed well has got the testing yield of 15. 1463 m3/d.
The main pay beds include Penglaizheng, Suining and Shaximiao in western Sichuan depression. The most of production in Luodai field and Xinchang field almost are from several prodelta facies sands. The gas saturation of sandstone is closely related to sedimentary facies type and the deployment of fault and sand. This paper analyzes the petroleum geology condition and the relationship between the deployment of fault and sand as well as the sedimentary, seismic facies. It is concluded that the permeability and the sealing ratio of a fault are key factors controlling the distribution of gas field. The gas is more likely to migrate to the upper sand and accumulate in the upper formation if the sealing ratio of faults is low and the permeability is high, otherwise, gas would migrate to the lower sand and accumulate in the lower formation. According to oil and gas accumulation pattern, a gas bearing sand in prodelta facies of Lu- odai field in western Sichuan Depression has been predicted, a disposed well has got the testing yield of 15. 1463 m3/d.
引文
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2杨克明,徐进．天然气成藏理论与勘探开发方法技术[M]．北京:地质出版社,2004:1-645
3张虹．川西致密碎屑岩气藏描述的物探方法技术[J]．石油物探,2002,41(增刊):253-260
4许红梅．关于川西地区油气地震预测模式的讨论[J]．油气地质与采收率,2002,9(3):70-72
5唐建明．川西坳陷致密非均质气藏储层空间展布刻划[J]．天然气工业,2002,22(4):19-23
6蔡开平,王应蓉,刘雪梅．川西南部侏罗系油气垂向运移特征[J]．西南石油学院学报,2000,22(4):1-5
7孙甫南,曾庆庸．川西地区南部侏罗系次生气藏形成机制探讨[J]．天然气工业,1994,14(1):23-28
8郭正吾．四川盆地西部浅层致密砂岩天然气勘探模式[J]．天然气工业,1997,17(3):5-13
9符晓,邓少云．川西新场气田中、浅层气藏特征及立体勘探开发的技术思路[J]．天然气工业,1997,17(3): 14-19
10吴世祥,江泽成,张林．川西侏罗系成藏主控因素及分类[J]．天然气工业,2001,21(4):20-23
11罗啸泉,郭东晓．川西孝泉一新场气田侏罗系次生气藏成藏条件初探[J]．天然气工业,1997,17(3):74-75
12吴志均,唐红君,安凤山．川西新场致密砂岩气藏层理缝成因探讨[J]．石油勘探与开发,2003,30(2):109- 111
13汪时成,张金川,贾庆素．川西坳陷异常高压形成机理与天然气分布关系研究[J]．天然气工业,2004,24(3): 5-8
14蔡开平,杨跃明,王应蓉．川西地区侏罗系气藏类型与勘探[J]．天然气工业,2001,21(2):9-12
15王亮国,余福林,邓康龄．川西坳陷侏罗系沉积环境[J]．油气地质与采收率,2001,8(6):13-16
16曾溅辉,金之均．油气二次运移和聚集物理模拟[M]．石油工业出版社,2000．150-183
17罗群,白新华．断裂控烃理论与实践[M]．中国地质大学出版社,1997．126-156
18曾文冲,欧阳健,何登春．测井地层分析与油气评价(下册)[M]．北京:石油工业出版社,1987．224-229
19蔡希源,李思田．陆相盆地高精度层序地层学[M]．北京:地质出版社,2003．63-65
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