川东北地区侏罗系含油气砂体横向预测研究

川东北侏罗系地层为一套巨厚的陆相沉积,近年来随着浅层钻探工作的开展,已经在这套地层中获得了多口工业气井,由此也表明:找准川东北侏罗系地层中的砂体,并获得其含油气情况是提高钻探成功率的关键.但是,该地区浅层的主要钻探目标-侏罗系沙溪庙组是一套横向变化较大的砂、泥岩互层结构,要预测出其中的砂体分布及其含油气情况显然具有较大的难度.遵循多学科综合研究的思想,通过地质、测井研究与地球物理信号分析技术相结合,在对川东北五宝场-渡口河地区侏罗系沙溪庙组沉积情况进行了仔细研究的基础上,利用地震资料速度反演、自然伽玛反演及能量吸收分析的联合解释,对上沙溪庙组中河道砂岩分布及其含油气情况进行了平面预测,从而为钻探提供了较为直观的参考资料,也为四川盆地浅层陆相碎屑岩沉积的储层预测探索了一条新的途径.

RESEARCH OF JURASSIC HYDROCARBONIC SANDSTON HORIZONTAL PREDICTION IN THE NORTH-EAST SICHUAN BASIN

In the north-east of Siehuan Basin, the Jurassic stratum is a set of very great thick continental deposition. In recent year, several industrial gas wells have been gotten from this stratum as drilling work was developed in the shallow stratum of Sichuan Basin. So, it shows: the key for increasing a success rate of drilling well is to find out the sandstone and supply about the hydrocarbonic information of the sandstone in the Jurassic stratum of the north-east Sichuan Basin. But, it is difficult to predict the distribution of the channel Sandstone and it's hydroearbonic ease because the main drilling target for Jurassic's J2s is a interbedding constitution with a great horizontal change of the sandstone and shale. In this paper, following a synthetic research view from multiple scientific subjects, first of all, to research carefully the J2s depositional situation in the Wu Baochang-Du Kouhe area of the north-east Sichuan Basin, and then, to combine the research of the geology and logging with the technology of the geophysical information analysis, the plane distribution of J2s2 channel sandstone and it's hydrocarbonic case were predicted by means of the synthetic interpretation of the velocity inversion (strata) and energy absorption analysis (weaa) for the seismic data for the drilling well but also to explore a new way for the reservoir prediction of the shallow continental deposition in Sichuan Basin.