川西拗陷知新场构造带须家河组成藏地质分析及勘探思路

摘要

知新场构造带位于川西坳陷东斜坡上,断裂极其发育.该区经历了多年勘探,目前在主体构造高部位钻有CQ128、CQ173、CQ171等井,在钻探过程中见到了良好的油气显示,但测试未获工业气流.在三维地震解释和对区内已钻井及邻区典型气藏解剖基础上,分析区内成藏地质条件及主控断裂封堵性,明确了知新场构造带勘探思路为"由构造高部位向构造两翼、由构造气藏向隐蔽岩性气藏、由泥中找砂向砂中找砂",指出构造两翼是须家河组勘探的重点区域,岩性圈闭是下步勘探的重要目标.%The Zhixin field tectonic belt is located on the east slope of the western Sichuan depression,and the fracture is extremely developed.The area has experienced many years of exploration.Currently,there are CQ128,CQ173,and CQ171 wells drilled in the high part of the main structure.In the drilling process,good oil and gas displays were seen,but the test did not obtain industrial gas flow.Based on the three-dimensional seismic interpretation and the anatomy of the typical gas reservoirs in the area and adjacent wells,this paper analyzes the geological conditions of the reservoirs and the sealing of the main control fractures in the area, and clarifies the concept of exploration of the Zhixin field structural belt as From the structural gas reservoirs to the concealed lithologic gas reservoirs and from the mud-finding sands to the sands,it is pointed out that the construction of the two wings is a key area for exploration of the Xujiahe Formation,and the lithologic traps are the next step of exploration.The important goal.