苏北闵桥玄武岩储油的地质模型

位于金湖凹陷西南部的闵桥是苏北高产油区之一，该区以深埋于１４００～１６００ｍ之下的阜宁组（Ｅｆ１—Ｅｆ１２）玄武岩（５８～６０Ｍａ）为储油层，其上阜宁组二段上部（Ｅｆ２２—Ｅｆ３２）为生油层．与储油密切相关的玄武岩中孔洞缝组合取决于岩相和相带中的不同部位，主要的储油岩相构造类型为：（１）玄武岩古风化壳；（２）岩流单元上部带；（３）淬碎角砾岩．深埋玄武岩为一基座直径约６．５ｋｍ的盾火山，现采油区位于这一盾火山西南近火口带．推断火口位置在油区ＮＥ１．５～２ｋｍ范围内，盾火山其余３／４面积可作为扩大油田的靶区

OIL_RESERVOIR GEOLOGICAL MODEL OF BASALT IN MINQIAO, NORTHERN JIANGSU PROVINCE

Minqiao, one of the high_yielding oil_fields in North Jiangsu Province, is situated to the southwest of Jinghu Depression, where the reservoir is basalt (E f 1-E f 1 2, 58-60Ma) of Funing Formation deeply buried below the depth of about 1400-1600m and the source is the upper part of the second segment (E f 2 2-E f 3 2) of Funing Formation. Assemblage of vesicles, holes and fissures in basalts closely related to oil reservoir are subjected to different positions in defferent lithofacies and facies belts. Three major oil_reservoir lithofacies_structure types have been determined in the field, i.e., ancient weathered crust of basalt, upper part of a lava flow unit and the quench_fragmented breccia. It shows that the deeply buried basalts came from a shield volcano with a base of about 6.5km in diameter and now the oil_production area is just confined in the periphery of the crater to the southwest of the shield volcano. Therefore, it can be inferred that the crater is situated within 1.5-2km to the northeast of the oil_production area and the other three quarters of the shield volcano can be considered as the prospect area for the enlargement of the oil_field.