【摘要】 综合分析钻井、测井、岩心等资料,对柴西南英西地区下干柴沟组上段进行了层序界面识别及层序特征分析,在此基础上建立了层序地层格架与层序发育模式,研究了有利储层分布位置。结果表明:层序发育受控于构造运动、古气候变化及湖平面升降;下干柴沟组上段自下而上可划分为2个三级层序,并进一步细分为6个四级层序,各级层序界面主要为岩性突变面,各级层序均发育湖侵体系域与湖退体系域,并均具有快速湖侵、缓慢湖退的特征;SQ3—SQ4表现为早期湖侵、中后期持续湖退,沉积相由半深湖亚相逐渐转变为盐湖亚相,SQ4发育大量岩盐盖层;有利储层主要发育于湖退体系域中部。更多还原

【Abstract】 Based on the analysis of drilling, logging and core data, the sequence interface was identified, and the characteristics of sequence were analyzed in the Upper Member of Lower Ganchaigou Formation in Yingxi area. On this basis, the sequence stratigraphic framework and sequence development model were established to study the distribution of favorable reservoir. The results show that sequence development was controlled by tectonic movement, paleoclimate change and lake-level fluctuation. The researched formation can be divided into two third-order sequences from bottom to top, and further subdivided into six fourth-order sequences. The sequence interfaces at all orders are mainly lithological mutation surfaces. The lacustrine transgressive system tract(LTST) and lacustrine regressive system tract(LRST) were developed in all orders of sequences; they all have the characteristics of rapid lacustrine transgression and slow lacustrine regression. From SQ3 to SQ4, it shows lacustrine transgression in the early stage and continuous lacustrine regression in the middle-late stage. The sedimentary facies gradually changed from semi-deep lake to salt lake, and a large number of evaporite caprocks developed in SQ4. The favorable reservoirs were mainly developed in the middle of the lacustrine regressive system tract.更多还原