Sequence Stratigraphy and Depositional Environments of the Kuche Depression
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摘要: 通过对库车坳陷野外露头和钻井资料以及地震剖面的综合分析,对库车盆地侏罗纪沉积环境、层序划分进行了研究.库车盆地在侏罗纪时期为一非对称型坳陷型盆地,主要物源在盆地的北部.划分了13个三级层序,三个层序组,反映了三个大级别的旋回.最大湖侵期为阳霞组中上部,与当时有一个明显的气候变热期相一致.沉积环境在侏罗纪早期为辫状河-辫状河三角洲环境、中期为曲流河-三角洲环境,后期为三角洲和浅湖环境,中期有短暂的海泛发生.影响侏罗纪湖平面变化的主控因素为构造运动、气候变化、物源条件、河水的流入以及海侵的影响.在中侏罗世早期、晚期的最大湖侵和海泛的短暂时期,形成了厚层的烃源岩分布.库车坳陷侏罗系虽然砂体分布广泛,厚度较大,然而由于陆相沉积环境的控制,非均质性较强、Abstract: Based on the analysis of outcrops,well logs and high resolution seismic reflection data,this paper tries to interpret the depositional enVironment and the seCuence stratigraphy of Jurassic in Kuche depression. The results show that the Kuche basin is a non-symmetry depression basin,of which the proVenance is from the north. There are 13 third seCuences and 3 seCuence beds,which are t he results of 3 cycles. The large lake transgression is the middle upper of Yangxia For mation,which is consistent to the hot climate. The enVironment is the braided riVer,meandering riVer- delta,and delta and shallowlake,with the ephemeral sea transgression. The source rock is well distributed in the ephemeral sea transgression and the large lake transgression in the middle Jurassic. the reservoir distribution is the key factor to forming oil and gas accumulation.the river reservoir heterogeneity is controlled by the terrestrial environment,although t here are the Well distri bution of the sandbody and great reservoir thickness.
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Key words:
- depression basin /
- climate seCuence /
- lake sedimention,reservoir /
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