塔北地区晚期成藏条件的初步分析

现代油气地质学强调从油气源岩、运移聚集到圈闭保存的全过程。塔北地区从古生界到新生界油气源岩丰富,储集层系发育且各种类型油气藏均有发现,但至今尚未找到古生新储油藏。依照野外采集标本的多项测试、已有资料的全面对比和构造演化特别是新构造运动和反转构造的考察分析,从油气派岩、运移聚集和古生新储3个方面阐述了塔北地区的晚期成藏条件。并指出由天山向塔里木盆地推进的前列式背驮构造、堑垒式引张构造及走滑转换构造可以成为晚期成藏的含油气局部构造。 

A PRELIMINARY ANALYSIS OF OIL-POOL FORMING CONDITIONS IN THE LATE PERIOD IN THE NORTHERN TARIM AREA

A whole process including oil-gas source,migration-accumulation and trap-preservation has been emphasized in the modern petroleum geology. From the Paleozoic to the Cenozoic Erathem there were rich oilgas sources and a well developed reservoir system;and various kinds of oil-gas pools have been discovered in the northern Tarim area. But up to now no oil-gas pools sourced from the Paleozoic in Cenozoic Erathem reservoirs are found in this area. According to numerous determinations of samples selected from the field,comprehensive comparision of collected data, and the observation and ahalyses of tectonic evolution,specially,the neotectonic movement and inversion tectonics,etc.,the oil pool forming condition in the late period in the northern Tarim area has been explained from three aspects: the oil-gas source,migration-accumulation and the Paleozoic sourced Cenozoic reservoir. Finally it is shown that the forward thrust fault block sequence of piggy-back pushing from the Tianshan Mountain to the Tarim basin,tensile structures with graben-horsts and strike slip transfer tectonics could become the oil-gas bearing local structures with oil pools formed in the late period.