川西盐井沟构造沙溪庙组砂体分布特征浅析
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摘要
近年来川西地区以侏罗系为目的层的浅层勘探获得了重大突破,与本工区相邻的白马庙构造在侏罗系钻获多口高产气井。盐井沟构造与白马庙构造具有相似的沉积环境和构造特征,并且盐浅1井在沙溪庙组中下部砂岩中获得工业气流,因而本工区侏罗系的砂岩储层极有可能成为川西地区主要产层之一。文章在对盐井沟构造沙溪庙组构造特征和砂岩分布作了详细分析基础上,对三维数据体进行了可视化解释,利用三维地震资料多种信息并结合本工区和邻区地质、钻井、测井资料,详细分析了沙溪庙组砂体地震响应特征,通过速度、伽马等多种测井资料的反演处理,并对反演数据体进行了多方位解释,指出了本区沙溪庙组砂体在横向上及纵向上的分布特征,提出本工区有利砂岩储层的预测模式,对砂体有利相带的平面分布和空间叠合关系作了详细的研究,为以后进一步勘探提供了翔实的地震资料。
The shallow exploration for Jurassic reservoirs in West Sichuan has made a great breakthrough in recent years, and there are several high gas-production wells drilled in Jurassic in Baimamiao structure being in close vie-mity to Yanjinggou structure. The sedimentary environment and structural features of the two structures are similar to each other, and commercial gas flow has been found in the middle-lower Shaximiao Formation sandstones (J2 ) in well Yanqian-1 in Yanjinggou structure,so that it is most possible for the Jurassic sandstone reservoirs in the work area to become one of main payzones in West Sichuan. In the paper, the 3-D data volume is visually interpreted on the basis of analyzing in detail the structural features and sandstone distribution of Shaximiao Formation in Yanjinggou structure; the seismic response characteristic of Shaximiao Formation sand-bodies is analyzed in detail by use of 3-D seismic data and in combination with the geological, drilling and log data of the work area and neighbouring regions; and, through inversing multiple log data, as velocity logging and gamma-ray logging, etc,and interpreting these inversion data in many ways, the lateral and vertical distribution characteristics of Shaximiao Formation sandbodies in the work area are pointed out, the prediction model of beneficial sandstone reservoir in the area is put forward and the plane distribution and spatial superposition of sandbody beneficial facies belts arc studied in detail,thus providing full and accurate seismic data for the further exploration in the future.
The shallow exploration for Jurassic reservoirs in West Sichuan has made a great breakthrough in recent years, and there are several high gas-production wells drilled in Jurassic in Baimamiao structure being in close vie-mity to Yanjinggou structure. The sedimentary environment and structural features of the two structures are similar to each other, and commercial gas flow has been found in the middle-lower Shaximiao Formation sandstones (J2 ) in well Yanqian-1 in Yanjinggou structure,so that it is most possible for the Jurassic sandstone reservoirs in the work area to become one of main payzones in West Sichuan. In the paper, the 3-D data volume is visually interpreted on the basis of analyzing in detail the structural features and sandstone distribution of Shaximiao Formation in Yanjinggou structure; the seismic response characteristic of Shaximiao Formation sand-bodies is analyzed in detail by use of 3-D seismic data and in combination with the geological, drilling and log data of the work area and neighbouring regions; and, through inversing multiple log data, as velocity logging and gamma-ray logging, etc,and interpreting these inversion data in many ways, the lateral and vertical distribution characteristics of Shaximiao Formation sandbodies in the work area are pointed out, the prediction model of beneficial sandstone reservoir in the area is put forward and the plane distribution and spatial superposition of sandbody beneficial facies belts arc studied in detail,thus providing full and accurate seismic data for the further exploration in the future.
引文
1 李剑波.川西坳陷中段沙溪庙组测井相和地震相及砂体展布特征.原成都理工学院学报,2001;(3)
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3 马波.川西自马庙蓬莱镇组含气砂体地震预测.天然气工 业,2002;(1)
4 匡建超等.加强四川盆地浅层天然气勘探是解决四川能 源短缺的重要策略.天然气工业,1995;(1)
5 吕正祥等.川西浅层气红色砂岩储层孔隙类型及控制因 素探讨.中国海上油气(地质),1996;(3)
2 吕正祥,卿淳,曾小英.川西新场气田下沙溪庙组气藏预 测评价研究.石油实验地质,2001;(4)
3 马波.川西自马庙蓬莱镇组含气砂体地震预测.天然气工 业,2002;(1)
4 匡建超等.加强四川盆地浅层天然气勘探是解决四川能 源短缺的重要策略.天然气工业,1995;(1)
5 吕正祥等.川西浅层气红色砂岩储层孔隙类型及控制因 素探讨.中国海上油气(地质),1996;(3)
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