塔里木盆地轮古东地区奥陶系碳酸盐岩储集层发育控制因素及有利区带预测

Controlling factors and favorable zones prediction of the Ordovician carbonate reservoir in Lungudong area, Tarim Basin

为探讨塔里木盆地轮古东地区奥陶系碳酸盐岩储集层发育的控制因素和寻找有利储集层的分布规律,作者分析了近几年该区的油气勘探资料,恢复了研究区的构造演化历史。研究结果表明,构造活动所引起的地层抬升、变形以及断裂作用对于碳酸盐岩形成岩溶型储集层及改变储集层原有物性起着建设性作用;优势沉积相的平面展布控制研究区油气藏的分布;加里东期存在2套风化壳岩溶,这2套岩溶制约了与岩溶有关的储集层分布,主要分布在表层岩溶至水平潜流带区域。根据碳酸盐岩储集层发育的控制因素,预测了有利储集层的分布,认为有利区带主要分布在研究区内2条大的走滑断裂以及桑塔木断垒带附近。

In order to study the controlling factors of the carbonate reservoir and to find the distribution patterns of favorable reservoir in Lungudong area, Tarim Basin, the data of petroleum exploration of recent years were analyzed and the structural evolution history was reconstructed in this paper. The results show that uplifting, deformation and fracture caused by the tectonic activities played constructive roles in the formation of carbonate karst and in changing the original properties of reservoirs; the distribution of oil and gas reservoirs were controlled by favorable sedimentary facies; two sets of weathering crusts were developed during the Caledonian Orogeny, and the reservoirs were restricted by them and were mainly distributed from epi-karst to horizontal subsurface zones. The favorable reservoirs are predicted to be mainly along the two large-scale strike-slip faults and the Sangtamu fault belt on the basis of the controlling factors of the carbonate reservoir development.