川东北五宝场构造沙溪庙组气藏勘探开发认识
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摘要
五宝场构造地处川东构造区边缘,位于大巴山弧形褶皱带与川东弧形褶皱带交汇处。该构造在侏罗系沙溪庙组获气,开辟了川东北陆相碎屑岩油气勘探的新领域。为此,利用地震、测井、综合地质及钻井资料,对浅层沙溪庙组地质基本特征进行了研究。结果认为,以嘉祥寨砂岩底界作为划分沙溪庙组沙二段、沙一段的分界线是可行的,明确提出沙溪庙组的天然气主要来自下伏须家河组及下侏罗统的陆相生烃岩系,河道沉积是最有利于储层发育的相带;通过储层特征分析,指出沙溪庙组储集类型为裂缝—孔隙型,气藏圈闭类型为构造—岩性圈闭;还对砂体的地震响应模式进行了探讨,归纳出了(含气)砂体在地震反射剖面及速度反演剖面上的响应模式。进而提出了“滚动勘探、整体开发、分批实施、优质砂体优先”的勘探开发思路。
Wubaochang structure is located on the edge of East Sichuan structural zone, where Dabashan and East Sichuan arc-like fold belts intersect. Gas is discovered in the Jurassic Shaximiao Formation in this structure, opening up a frontier for exploration of continental clastic rock reservoirs in the northeastern Sichuan Basin. The basic geologic features of the shallow Shaximiao Formation are comprehensively studied by using seismic, logging, composite geologic and drilling data. The lower boundary of Jiaxiangzhai sandstone can be used as the interface for dividing the first and the second members of the Shaximiao Formation. The gas in the Shaximiao Formation is mainly sourced from the underlying continental source rocks of the Xujiahe Formation and the Lower Jurassic, and the fluvial facies is the most favorable facies belt for reservoir development. Reservoir feature analyses show that the Shaximiao Formation reservoir is of fracture-pore type, and the trap is of structural-lithologic type. The responses of gas-bearing sandbodies on seismic reflection profile and on velocity inversion profile are summarized. A guiding principle for gas exploration and development is presented, i.e. "progressive exploration, development as a whole, implementation step by step, giving priority to sandbodies of high quality".
Wubaochang structure is located on the edge of East Sichuan structural zone, where Dabashan and East Sichuan arc-like fold belts intersect. Gas is discovered in the Jurassic Shaximiao Formation in this structure, opening up a frontier for exploration of continental clastic rock reservoirs in the northeastern Sichuan Basin. The basic geologic features of the shallow Shaximiao Formation are comprehensively studied by using seismic, logging, composite geologic and drilling data. The lower boundary of Jiaxiangzhai sandstone can be used as the interface for dividing the first and the second members of the Shaximiao Formation. The gas in the Shaximiao Formation is mainly sourced from the underlying continental source rocks of the Xujiahe Formation and the Lower Jurassic, and the fluvial facies is the most favorable facies belt for reservoir development. Reservoir feature analyses show that the Shaximiao Formation reservoir is of fracture-pore type, and the trap is of structural-lithologic type. The responses of gas-bearing sandbodies on seismic reflection profile and on velocity inversion profile are summarized. A guiding principle for gas exploration and development is presented, i.e. "progressive exploration, development as a whole, implementation step by step, giving priority to sandbodies of high quality".
引文
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[3]严维礼、费怀义等,《四川盆地五宝场区块沙溪庙组气藏开发前期评价》,2006。
[1]马廷虎,等.渡口河构造珍珠冲段浅层天然气成藏条件分析[J].天然气工业,2005,25(9):14-16.
[2]罗啸泉,等.川西坳陷上三叠统油气运移特征[J].天然气工业,2004,24(8):4-7.
[3]蔡开平,等.川西地区侏罗系气藏气源研究[J].天然气工业,2000,20(1):36-40.
[4]郭正吾,等.四川盆地形成与演化[M].北京:地质出版社,1996:10-100.
[5]赵良孝,等.碳酸盐岩储层测井评价技术[M].北京:石油工业出版社,1994:20-30.
[6]杨洪志,等.先进技术在白马庙蓬莱镇组低渗气藏开发中的应用[J].天然气勘探与开发,2006,29(1):31-34.
[7]马廷虎,肖富森,等.东溪气田嘉陵江组低效气藏地质特征与挖潜思路.天然气工业,2007,27(2):10-12.
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