摘要
三塘湖盆地南缘冲断带位于中央凹陷带以南,以南缘逆冲推覆断裂带为界与中央凹陷带分隔,紧邻条湖、马朗两大生油气凹陷,发育多套储盖组合。逆冲推覆带的形成,主要受控于晚海西运动和晚燕山运动。逆掩推覆带下盘发育石板墩、黑墩两个构造带。目前,已发现黑墩上二叠统芦草沟组(P2l)、石板墩上石炭统卡拉岗组(C2k)和西峡沟M4-T14区块中侏罗统西山窑组(J2x)等多层系油气藏,证实为一复式油气聚集带。构造、岩性、裂缝和火山岩体控制了油气藏的形成与分布。下一步应在积极拓展积极探索南缘冲断带二叠系裂缝型油藏,兼顾中生界砂岩及古生界火山岩油藏,勘探思路应从构造控油打高点向岩性控油打河道、裂缝控油打破碎带、火山岩体控油打火山体转变。
Thrust belt of the southern margin in Santanghu Basin is located in the south of the central depression, is limited by the thrust fault zone of south edge, is separated by the central depression, and is close to Tiaohu and Malang hydrocarbon depressions, and developed many reservoir - caprock assemblages. Formation of thrust nappe belt is dominated by the late Hercynian movement and the late Yanshan movement. Two tectonic belts, Shibandun and Heidun, grow in the overthrust nappe footwall. At present, multilayered reservoir such as Heidun （P21）, Shibandun （C2k） and J2x in Xixiagou block （M4 -T14） have been found, it has been proved that it is a complicated hydrocarbon accumulation zone. Formation and distribution of hydrocarbon reservoir are controlled by structure, lithology, crack and volcanic rock. The next step should actively explore Permian fractured reservoir in thrust fault in south margin, as well as Mesozoic sandstone and Paleozoic volcanic reservoirs. Exploration ideas should change from finding structure high in structure trap to finding river channel in lithology trap, fracture growth belt in fractured trap and volcanic body in volcanic trap.
出处
《吐哈油气》
2009年第1期13-17,共5页
Tuha Oil & Gas
关键词
成藏条件
主控因素
探勘方向
南缘冲断带
三塘湖盆地
accumulation conditions
dominative factors
exploration target
thrust fault belt in south margin
Santanghu basin
