四川盆地南部栖霞组裂缝与溶蚀孔洞型天然气储层预测

FORECAST OF QIXIA FORMATION FRACTURES AND DISSOLUTION PORE GAS RESERVOIR IN SOUTHERN SICHUAN BASIN

碳酸盐岩气藏在四川盆地天然气勘探中占有重要的位置,但是对栖霞组的研究还没有得到足够的重视。裂缝和溶蚀孔洞是栖霞组的最主要的储集空间,可靠的预测裂缝和溶蚀孔洞发育带是能否有效勘探开发该类型油气藏的重要因素。文章在综合分析测井地震资料的基础上,对研究区内储层波形进行对比和平面分布刻画,同时利用相干属性和叠前各向异性检测对裂缝和溶蚀孔洞进行预测,提出了勘探有利区域并总结储层发育模式,为栖霞组气藏进一步的勘探提供了理论支持。

Carbonate gas reservoir is a main exploration target for gas in Sichuan basin, but Qixia formation carbonate is neglected. Its fractures and dissolution pores are the major reservoir for gas. A reliable forecast of its fractures and dissolution pores is key to the exploration. This paper, based on logging and seismic data, compares the reservoir waveforms and distribution, uses coherent attributes and pre-overlapping anisotropy check to forecast Qixia formation fractures and dissolution pores, and presents exploration targets based on reservoir development model, offering theoretical support for further gas exploration in Qixia formation.