冀中坳陷束鹿凹陷致密油成藏特征探讨

致密油资源是目前和未来一段时间我国非常规油气勘探和开发的主体,具有连续性成藏的特点。利用地震、钻井地质和测试资料,结合勘探实践,对渤海湾盆地冀中坳陷束鹿凹陷泥灰岩致密油成藏特征进行了研究。结果表明,束鹿凹陷致密油藏的形成主要受优质烃源岩、致密储层的控制;具有源储一体、近源成藏特征,具备形成致密油的良好条件;平面上,凹陷洼槽中心区与斜坡带低部位是泥灰岩致密油主要分布区,纵向上集中于沙三下亚段厚层泥灰岩段,具有纵向上整体含油、平面上局部富集分布特征。研究区存在围绕中洼和南洼的两个泥灰岩致密油规模分布区,目前多口井已钻获工业油气流,资源潜力大,为下步有利勘探区。

Accumulation features of tight oil reservoir in Shulu sag of Central Hebei

Tight oil resources ,with the continuous accumulation characteristics ,are becoming the main part of the uncon-ventional oil and gas exploration and development in China .Combined with the exploration practice ,the accumulation fea-tures of the marlstone tight oil reservoirs in Shulu sag were analyzed and evaluated by using core ,seismic data,geological drilling and geochemical data ,etc.The enrichment of the tight oil is controlled by the distribution of effective source rocks and tight marls reservoirs .High quality source rocks in the mature stage belong to tight reservoirs which provide good condi -tions for tight oil accumulation .The tight oi1 reservoirs are mainly distributed in the centre and slope region of the sag ,and the thick layer of marl segment in the member 3 of Shahejie formation is longitudinal sweet point .The tight oil occurred in the entire strata vertically and spread special areas horizontally .The researched region in Shulu sag has two main tight oil distri-bution areas which are medium and southern depressions .At present,many wells,which got industry production rate ,have been drilled successfully .So the Shulu sag with a large potential for tight oil is the next favorable exploration area .