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中、下侏罗统是柴达木盆地东部主力生烃层系,针对前人“早—中侏罗世广盆沉积、现今凹陷均残留分布”的普遍认识与实际钻探不相符的矛盾,在充分利用野外地质调查、钻井、地震、电法等成果资料基础上,系统梳理了侏罗系露头层段归属与横向差异,研究了早—中侏罗世原始沉积与残留分布规律,认为研究区早—中侏罗世发育鱼卡、红山、德令哈、霍布逊等4个分隔性湖盆,并非广盆沉积,马海古隆起、欧龙布鲁克低凸起等造成原始沉积湖盆分割性较强;中、下侏罗统平面上局限分布于尕西、鱼卡、红山、小柴旦、霍布逊和德令哈等6个凹陷,并且在凹陷带、山前冲断带均有分布,并非与现今凹陷一一对应,欧南、大柴旦等凹陷均不发育中、下侏罗统。其残留分布主要受控于早—中侏罗世原始沉积和燕山运动晚期隆升改造两大因素,平面上严格受南祁连、埃南等NW向控山、控凹断裂和马仙等NE向、近EW向调节断裂的双重控制,从而造成现今凹陷之间、控凹断裂上下盘之间中、下侏罗统残留厚度的差异。
Middle and Lower Jurassic are the main hydrocarbon generating strata in the east of the Qaidam Basin. According to the contradiction between the common understanding and the actual drilling of the previous “early-middle Jurassic sediments in the basin and the current depression remaining distribution” Based on the data of the field geological survey, drilling, seismic and electric method, the distribution and horizontal distribution of the outcrops in the Jurassic are systematically analyzed. The distribution of the primary sediments and residues in the Early-Middle Jurassic are studied. Early - Middle Jurassic development of fish card, Hongshan, Delingha, Hobson and other four separate lakes, not the basin sedimentary, the Mahagou uplift, the Oolongbuluok low protuberance caused by the original sedimentary lake basin It is strongly divisible. The Middle and Lower Jurassic confines are distributed in 6 depressions, such as Ga-xia, Yuka, Hongshan, Xiaoqiaidan, Hobusun and Delingha, Are distributed, not with the current depression one by one correspondence, the Au Nan, Dachaidan depression are not developed, the Lower Jurassic. The residual distribution is mainly controlled by the two factors of the early deposition of Early-Middle Jurassic and the late uplift of Yanshan Movement. The distribution of these residues is strictly controlled by the NW-controlled hills, controlled-depression faults, To the near EW to regulate the dual control of the fracture, resulting in the present between the sag, sag fault fracture between the upper and lower Jurassic residual thickness differences.