宁夏探区上古生界地质特征与油气成藏研究

Upper Paleozoic geological characteristics and hydrocarbon accumulation exploration areas in Ningxia

宁夏地区古生界烃源岩主要为太原组、山西组的煤层及暗色泥岩,有机碳含量为0.2%~7.95%,Ro平均为2.34%,干酪根类型为Ⅱ和Ⅲ型,烃源岩普遍处于高成熟—过成熟阶段;盖层主要为二叠系下部的高位体系域和水进的滨浅湖相泥岩,连续性好,封闭性好;储集层主要为三角洲平原分流河道砂体、水下分流河道砂体;油气成藏主要受区域构造及储层控制。

Ningxia Paleozoic source rocks in Taiyuan and Shanxi coal seam and dark mudstone, organic carbon content of 0.2%- 7.95%, Ro average of 2.34%, kerogen type II and Ill, widespread source rocks in high maturity - over mature stage; lower portion of the cap layer is mainly Permian HST and water into the shore shallow lacustrine mudstones, continuity, closure is good; the main reservoir for the delta plain distributary channel sand body, underwater distributary channel sand body; hydrocarbon accumulation is mainly affected by the regional structure and reservoir control.