饶阳凹陷马西洼槽沙三段岩性油藏勘探实践

马西洼槽是饶阳凹陷油气最富集的生油洼槽之一，剩余资源量丰富。随着勘探的不断深入，勘探程度低、潜力大且具备形成岩性油藏成藏条件的沙三段，成为下步勘探的重要层系。但沙三段沉积时期沉积特征复杂，勘探难度较大。重新分析成藏条件，通过构造背景研究，寻找有利岩性勘探区带；开展层序地层学研究，确定有利岩性勘探层系；沉积相综合分析，构建多种岩性成藏模式；利用全三维解释技术进行精细解释，识别岩性圈闭；评价优选勘探目标实施钻探。在马西洼槽的西部斜坡带及东部断阶带构建岩性圈闭，设计钻探的西61x井、西64x井、马98井均获成功，2012年马西地区上交控制石油储量2696×10^4t。勘探实践表明，富油洼槽中深层是岩性油藏勘探的有利方向。

Lithologic Reservoir Exploration in Third Member of Shahejie Formation,Maxi Subsag in Raoyang Sag

Maxi subsag is one of the hydrocarbon-richest oil-generating subsags in Raoyang sag, which has abundant remaining resources. With increasing exploration, the third member of Shahejie Formation of low exploration degree, huge potential and lithologic reservoir- forming conditions becomes the important series of strata for further exploration. However, the third member of Shahejie Formation is difficult to be explored, because of its complicated sedimentary features during sedimentary stage. This paper suggested analyzing reservoir-forming conditions again and looking for favorable lithologic exploration zones based on tectonic setting study, carrying out sequence stratigraphic research and confirming favorable lithologic exploration series of strata, comprehensively analyzing sedimentary facies and establishing multiple lithologic reservoir-forming mode, using full 3D interpretation techniques for meticulous interpretation and identifying lithologic traps, evaluating and optimizing exploration targets to implement drilling and exploration. Well Xi61x, Well Xi64x and Well Ma98 were drilled successfully in the lithologic traps of the western slope and the eastern fracture zone. In 2012, probable petroleum reserves submitted by Maxi area were 26.96 million tons. Exploration practice shows that the deep layers of oil-rich subsags are favorable targets for lithologic reservoir exploration.