艾参一井有机质热演化特征与生油门限的确定

THERMAL EVOLUTION OF ORGANIC MATTERS AND PETROLEUM GENERATION THRESHOLD FOR WELL AICAN-1

杨斌 马强民 甘樟槐

Yang Bin Ma Qiangmin Gan Zhanghuai

艾参1井位于准噶尔盆地西北缘玛纳斯湖坳陷西北侧,玛纳斯湖与艾里克湖之间,终孔井深5700.13米,钻遇地层及各层厚度见表1。

Well Aican-1 is located in the northwest part of Manas depression near the northwestern border of Junggar Basin,with its depth being 5700.13m.The well is ended in the Xiazijie Formation of the Lower Permian.Three suites of source rocks are intersected,i.e.the Lower Jurassic Sangonghe For-mation(Js),the lower Baijiantan Formation(Tb)of the Upper Triassicand the lower Wu'erhe Formation of the Upper Permian(Pw).Studies of the well temperature,vitrinite reflectance(Ro%),TAI,T-max,S/(S+S),S/TOC,CPI and 17 steranes and terpanes indices mea-sured by Rock-Eval indicate that the kerogen from the above mentioned for-mations is of humic type,derived in process of thermal evolution.On the basis of this,it is inferred that the threshold depth of oil-generation is about 2,830m,2,830-3,500m at low mature stage,3,500-4,400m at high mature stage,4,400-5,600m at wet gas and condensate stage,and deeper than 5,600m at over-mature stage.

10.11743/ogg19850406