塔河地区三叠系油气充注幕次划分与成藏时期确定

Determination of hydrocarbon charging events and timing of accumulation in the Triassic of Tahe area,the Tarim Basin

吕海涛 陈红汉 唐大卿 马黎

Lü Haitao Chen Honghan Tang Daqing Ma Li

受区域构造"跷跷板"运动和断裂输导体系控制,塔河地区三叠系经历了比较复杂的油气成藏过程。通过291块流体包裹体样品的系统分析,运用油包裹体荧光颜色、均一温度统计分布以及埋藏史投影法获得了工区三叠系各充注幕次的充注年龄和成藏期次,并确定了其油气成藏时期。结果表明,工区三叠系上、中、下油组均可划分出3幕油气充注,但北部的于奇地区为早期(40～7.5Ma)3幕不连续充注成藏,中南部为晚期(11～0.9Ma)3幕连续充注成藏。由此认为,塔河地区三叠系发育"沟源"断层的盐边、盐上构造带和岩性上倾尖灭带应是下一步勘探的有利目标。

Controlled by regional "seesaw" tectonic movements and the fault carrier system,the Triassic of the Tahe area experienced a very complicated hydrocarbon accumulation process.In this study,we systematically analyzed 291 fluid inclusion samples.The hydrocarbon charging events and timing of accumulation in the Triassic were determined according to the fluorescent colors of oil inclusions and through projecting the homogenization temperature on burial history.The results show that,each of the upper,middle and lower oil layers in the Triassic were charged in three stages.The reservoirs in the northern Yuqi area were charged in the earlier(40-7.5 Ma) three discontinuous stages,while the reservoirs in the central-south area were charged in the later(11-0.9 Ma) three continuous stages.Based on these understandings,we have proposed that the peri-salt and supra-salt structural zones and lithological updip pinchout zones are the favorable targets for further exploration.

10.11743/ogg20090308