板桥和歧北凹陷沙河街组深层碎屑岩储层物性特征及其影响因素

PHYSICAL PROPERTIES OF RESERVOIR AND INFLUENCING FACTORS OF DEEP BURIAL CLASTIC ROCKS IN BANQIAO-QIBEI SAG

对黄骅坳陷板桥和歧北凹陷深层沙河街组碎屑岩储层储集物性分布特征及其影响因素分析表明 ,深层碎屑岩储层物性在横向上受砂体微相控制 ,在纵向上受次生孔隙发育带控制 ,并具有强烈的非均质性。在板桥和歧北凹陷中 ,沙二、沙三段深层碎屑岩的有利储集相带与有利沉积相带及碎屑组分的溶解作用带具有明显的一致性。深部异常高压带、烃类的早期侵入和有利的储层埋藏史对于深层碎屑岩储层具备良好的储集空间及含油气性创造了条件。

The deep buried Shahejie formation of the lower Tertiary is the most important exploration area in Banqiao sag and Qibei sag of Huanghua Depression. Deep burial clastic reservoirs were formed in fandeltas, alluvial finger bar, beachy bar and deep water channel of gravity current. The comprehensive studies on the reservoir physical properties of deep burial clastic rocks and its influencing factors indicate that the physical properties of deep burial reservoirs were dominated by sandbody microfacies in the lateral direction and by secondary porosity zones in the vertical direction. The reservoirs have a strong heterogeneity. The physical properties of deep burial reservoirs are relative to the favorable sedimentary facies, dissolution zones of clastic grain compositions and cements. The high abnormal pressure zones, early hydrocarbon invasion and favorable burial history of reservoirs all provided good conditions for preserving physical properties of deep burial sandstones.