柴达木盆地七个泉地区下干柴沟组体系域和沉积相

System Tract and Depositional Facies of Lower Ganchaigou Formation in Qigequan Area, Qaidam Basin

通过对七个泉地区地质录井和测井曲线资料分析,在下干柴沟组下段识别出2个沉积体系域。体系域主要为湖侵体系域和湖退体系域,其中储集体类型较为丰富,主要为扇三角洲砂体和深湖-半深湖浊积砂体。将测井层序分析结果和地震储集层预测技术相结合,以体系域进行地震属性分析和沉积相编图,预测在七个泉地区东南部的三角洲前缘和北部的湖底扇砂体能够形成岩性油气藏。

Transgressive system tract and regressive system tract in lower member of Lower Ganchaihou formation are recognized from the analysis of geological logging and well logs in Qigequan area. The reservoir rock type is dominated by fan-delta sand body and deep-hemideep lake turbidite sand body. The log sequence analysis is integrated with seismic reservoir prediction technique. The system tract is applied to the analysis of seismic attribute and the map compilation of sedimentary facies. It is predicted that lithologic oil-gas reservoir may be shaped in the delta front of the southeastern Qigequan area and the sublacustrine fan's sand body of the northern Qigequan area.