准噶尔盆地沙窝地岩性圈闭形成机理及识别

岩性圈闭是唯噶尔盆地沙窝地地区最主要的圈闭类型，从油气成藏的要素入手，提出了沙窝地岩性圈闭的成藏模式，沙窝地岩性圈闭成藏可能以古隆起和沉积砂体联合成藏，后期改造不明显，具原生成藏特点。利用合成地震记录方法，进行研究单元的标定，并根据已知岩性油藏建立模式，采用常规地震相识别，地震属性取，测井地震约束反演等技术进行砂体预测，指出工区业二工河组二段是有潜力的储集层，证实了三角洲前缘河道砂体的存在，指出盆Ⅰ井西凹陷发育多个古隆起，是油气长期运移的指向区，余坡带发育侏罗系三角洲砂体，易形成岩性-构造型油气藏。盆地腹部的低幅构造和岩性圈闭应是主要的勘探对象。

The Forming Mechanism and Identification Method of Shawodi Lithologic Traps in Junggar Basin

Lithologic trap is the most important type of traps in Shawodi area of Junggar basin. This paper presents the model of Shawodi litho-logic-trap reservoir. In light of the factors of petroleum accumulation, it is a reservoir probably accumulated together with palaeohigh and sedimentary sand bodies with characteristics of unobvious late reconstruction and primary accumulation. Synthetic seismogram is used for calibration of the stratigraphic units. Available lithologic reservoir models and such techniques as conventional seismic facies recognition, seismic attribute pickup and well log-constrained seismic inversion are applied for prediction of the sand bodies. The results show that in studied area the second member of Sangonghe formation is the potential reservoir, demonstrating the existence of the channel sand body in delta frontal facies; in western sag of Peng-1 Well develop several palaeohighs, which are the favorable areas for long-term hydrocarbon migration; in slope facies belt occur Jurassic delta sand bodies, which may help to shape litho-structural oil-gas reservoir; and the low-amplitude structure and lithologic trap in hinterland of Junggar basin should be as major targets for hydrocarbon prospecting.