摘要
四川盆地中二叠统茅口组储集层非均质性强、成因复杂,对储集层发育的主控因素及分布规律存在较大争议,这给茅口组油气勘探造成很大困扰。利用野外剖面、邻区钻井以及地震勘探等资料,从岩相古地理、储集层特征、地震储集层预测等方面,探讨了四川盆地西部茅口组储集层成因。认为,四川盆地茅口组在碳酸盐岩大缓坡沉积体系下,西部地区发育大规模浅水高能礁滩相带,从而证实了金马—鸭子河构造带和龙泉山隐伏构造带发育着由二叠系断至基底的深大断裂;茅口组顶部礁滩相沉积在不整合面岩溶和断裂相关热液白云岩化双重作用下,可能普遍发育溶蚀孔洞型储集层及热液白云岩储集层,是四川盆地西部寻找茅口组大规模气藏的有利区带。
The strong heterogeneity and complex genesis are observed in the Maokou reservoir of the Middle Permian in Sichuan basin. There are lots of disputes about the understandings of the main controls on reservoir development and reservoir distribution, which brings great trouble to the exploration of Maokou formaion. Using the data of field sections, drilling data in the neighboring area and seismic exploration, the paper demonstrates the reservoir genesis of Maokou formation in Sichan basin from 3 aspects such as lithfacies paleogeography, reservoir characteristics and seismic reservoir prediction. It is considered that the Maokou formation is in the great gentle-slope sedimentary system of carbonate rocks; large-scale shallow-water high-energy reef-flat facies belts occur in western Sichuan basin, which can verify the existence of great deep faults penetrating from Permian strata to basement in Jinma-Yazihe structural belt and Longquanshan buried structural belt; dissolved pore-cavity reservoir and hydrothermal dolomite reservoir may be widely developed in the reef flat sediments at the top of Maokou formation under the actions of both unconformity karstification and fracture-related hydrothermal dolomitization. The above 2 types of reservoirs are the key favorable zones for large-scale gas reservoir exploration in Makou formation in western Sichuan basin .
出处
《新疆石油地质》
CAS
CSCD
北大核心
2016年第5期512-518,共7页
Xinjiang Petroleum Geology
基金
中国石化科技重大专项(P13022)
关键词
四川盆地西部
二叠系
茅口组
储集层
风化壳岩溶
热液白云岩化作用
western Sichuan basin
Permian
Maokou formation
reservoir
weathering crust karstification
hydrothermal dolomitization
