柴达木盆地七个泉地区渐新世沉积特征与隐蔽油藏预测

发布时间：2018-09-18 06:32

【摘要】：在油气开发的后期阶段,特别是构造油气藏已经不能满足生产需要的时候,利用层序精细划分和沉积微相分析等方法来寻找隐蔽油藏就显得尤为重要。通过对三维地震、钻井岩心、测井曲线等资料进行综合分析,利用三维地震资料控制沉积相空间展布,利用钻井和录井资料划分砂体小层,并将两者结合起来对柴达木盆地七个泉地区沉积相和层序进行精细刻画,同时在沉积相带内和层序格架之下研究砂体的连通性和空间展布。结果表明,在SSC5—SSC3沉积时期,研究区沉积主要以退积为主,在SSC2沉积时期经历了一次快速的水退过程之后,SSC2—SSC1沉积时期沉积基准面持续下降,后期主要以扇三角洲沉积为主。研究区渐新世下干柴沟组下段主要发育湖泊—扇三角洲和辫状河三角洲沉积。辫状河三角洲沉积发育水下分流河道、水下分流河道间、河口坝和席状砂沉积微相;扇三角洲发育扇三角洲平原和扇三角洲前缘亚相。通过对砂体展布和砂体孔渗性以及试油结果的研究,并依据沉积相与层序格架分析,预测在七32井区附近发育的斜坡带砂岩透镜体和上倾尖灭砂体是岩性油藏勘探的重点目标。
[Abstract]:In the late stage of oil and gas development, especially when the structural reservoirs can no longer meet the production needs, it is particularly important to use the methods of fine sequence division and sedimentary microfacies analysis to find subtle reservoirs. Through the comprehensive analysis of 3D seismic, drilling core and logging curves, the spatial distribution of sedimentary facies is controlled by using 3D seismic data, and the sand body small layers are divided by drilling and logging data. The sedimentary facies and sequence in Qiquan area of Qaidam Basin are described in detail, and the connectivity and spatial distribution of sand bodies are studied within the sedimentary facies belt and under the sequence framework. The results show that during the period of SSC5-SSC3 deposition, the deposition in the study area was mainly retrograde, and the base level of SSC2-SSC1 depositional period decreased continuously after a rapid process of water regression in the period of SSC2 deposition. The late stage is mainly fan delta deposition. Lacustrine fan deltas and braided river deltas are mainly developed in the lower member of Lower Ganchaigou formation of Oligocene in the study area. The deposition of braided river delta develops subaqueous distributary channel, interchannel distributary channel, estuarine bar and sheet sand sedimentary microfacies, fan delta develops fan delta plain and front subfacies of fan delta. Based on the study of the distribution of sand bodies, pore permeability of sand bodies and oil test results, and based on the analysis of sedimentary facies and sequence framework, it is predicted that the sandstone lens body and the updip tip out sand body developed near well 732 are the key targets of lithologic reservoir exploration.
【作者单位】：中国地质大学(武汉)构造与油气资源教育部重点实验室;中国石油华北油田分公司山西煤层气勘探开发分公司;
【基金】：国家自然科学基金项目“页岩中的后油沥青孔隙体系:基本特征、形成机制与页岩油气地质意义”(41372112);“南海北部陆缘大型深水峡谷体系形成机制及充填构型对比研究”(41572109)
【分类号】：P618.13

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