沉积盆地花岗岩的分布特征及其对油气藏的影响

Distribution characteristics of granite in sedimentary basin and its influence
on oil and gas reservoir

刘安 吴世敏 李旭兵 程卫华

中国地质调查局武汉地质矿产研究所，湖北 武汉 430205 中山大学地球科学系，广东 广州 510275 中国海洋石油有限公司深圳分公司，广东 广州 510240

Wuhan Institute of Geology and Mineral Resources, China Geological Survey, Wuhan 430205, China Department of Earth Science, Sun Yat-Sen University, Guangzhou 510275, China Shenzhen Branch of CNOOC Ltd., Guangzhou 510240, China)

文中总结了沉积盆地中花岗岩的分布规律，影响油气资源的花岗岩往往分布在盆地的断裂和隆起带，表现为穹窿或背斜。盆地中壳源花岗岩侵入表明上地壳温度大范围整体上升，花岗岩体是盆地地温场整体上升背景下的异常高点。盆地基底花岗岩表现为隆起、抗风化性强、裂隙系统发育等性质使之与基岩油气藏关系密切，与花岗岩密切相关的油气藏类型主要有花岗岩风化壳或花岗岩冲刷沉积油气藏、花岗岩基底裂缝油气藏、花岗岩基底隆起披覆油气藏；沉积盆地不同区域因地质条件不同会存在不同类型的基岩油气藏。

This paper summarizes the distribution law of granite in sedimentary basin. The granites influenced on oil and gas resources are mainly distributed in fault and uplift belts of basin, marked by dome or anticline. Granite intrusions indicate the temperature of upper crust rises with a wide range and the granite is abnormal high point in the basin with increasing temperature. Granite has close relationship with basement hydrocarbon reservoirs, because the granites have the characteristics of rising in basin basement, better fracture system and strong anti-weathering capacity, including granite weathering crust or granite washing reservoir, fractured granite reservoir, drape anticline on granite. There are different basement reservoirs in different area of sedimentary basin because of various geology conditions.

10.6056/dkyqt201305001