阜康凹陷小泉沟群烃源岩评价及勘探建议

EVALUATION AND EXPLORATION PROPOSAL OF THE HYDROCARBON SOURCE ROCKS IN XIAOQUANGOU GROUP OF FUKANG SAG

侏罗系、二叠系和石炭系是准噶尔盆地东部探区得到公认的三套有效烃源岩,而阜康凹陷三叠系小泉沟群因尚未确认源自该套地层的大量原油,其能否成为准东探区的有效源岩尚存争议。系统评价了该套地层的生油潜力,认为其有机质丰度高、类型相对较好、在热史演化上目前已达到生油高峰,是一套生烃强度较高的烃源岩。前人研究认为,阜康凹陷阜5井三叠系小泉沟群原油来源于小泉沟群烃源岩,表明阜康凹陷三叠系小泉沟群烃源岩具有生烃的潜力。该烃源岩是继二叠系平地泉组之后阜康凹陷发现的又一套好的烃源岩,该烃源岩的发现对准噶尔盆地油气资源潜力评估和勘探具有十分重要的意义。

It is generally acknowledged that there are three series of hydrocarbon source rocks in Jurassic,Permian and Carboniferous formations in the east of Junggar Basin.A great quantity of oil whether from the Xiaoquangou Group of Triassic or not is not confirmed in Fukang Sag.However,no agreement has reached whether the Xiaoquangou Group of Triassic in Zhundong exploration area is effective hydrocarbon source rocks.A systematic analysis of the oil generation potential of the hydrocarbons in the area is carried out in this paper.The analysis indicates that the organic matter is rich in abundance and relatively good in the type and that they have come to the peak of oil production at present in thermal evolution.It is suggested that they should be the reasonable source for the hydrocarbon.Previous research discovered that the oil from Well Fu 5 of the Triassic Xiaoquangou Group actually came from the hydrocarbon of Xiaoquangou Group in Fukang Sag,which indicates that the Xiaoquangou in Fukang Sag possesses hydrocarbon-generating potential.Hence,the evaluation of hydrocarbon-generating potential will be of great significance for the oil and gas exploration in the Junggar Basin.