A STUDY OF SEDIMENTARY CHARACTERISTICS AND PETROLLFEROUSNESS IN THE JURASSICSEQUENCES OF THE FAULT REGION, THE SE TARIM BASIN

Ten oil-bearing sandstone beds with a thickness up to 103m were discovered in thesections of the Jurassic sequences,Zhenggeleke,Qiemo County,Xinjiang. This is the firstdiscovery in the region of the SE Tarim Basin,It is suggested that the petroleum source inthe oil bearing sandstones should be attributed to shallow marine source rocks of the un-derlying Paleozoic sequerices and the reservoir should be composed of Middle Jurassic dilu-vial-fluvial sand body,while the upper Jurassic dark mudstone with a thickness of 80mact as its immediate cap bed.Since this kind of source, reservoir and seal assemblege foroil/gas pools is very popular in the region,this discovery provides a guideline to the petro-liferous evaluation and the selection of exploratory prespects in this region.