利用测井资料研究特低渗储层的沉积相带

陕北斜坡中部特低渗透储集层受沉积环境、成岩作用、构造等因素影响,储层沉积相带特征十分复杂,利用测井曲线,分析地层信息与各种成因标志及其相应沉积环境中水动力因素作用关系,研究了测井相与沉积微相及其储集砂体分布发育,确认了三角洲前缘亚相水下分流河道微相及其河道叠置型河口坝微相是形成本区低渗透储集砂体的有利相带。它们控制砂体的走向和分布,具有砂体连片、连通性好、厚度较大的特点。通过该区长332储层沉积微相和含油有利区域油藏分布预测研究,油藏处在区域由北西到南东发育的5条水系水下分流河道中部及西南部主体带上,这些有利沉积相带控制和圈定的含油有利区域油藏,总体具有中部向南西方向的中下游不断加强的特点,为该区油藏进一步滚动扩边开发提供了可靠的地质依据。

Favomble sedirnentary facies research of low permeability reservoir with well logging data

Aiming at the fact that the extra - low permeability reservoir in middle Shanbei slope is affected by some factors such as sedimentary environment、diagenesis, tectonics etc, which leads the property of reservoir sedimentary facies becoming extremely complex. Using well - log curves, this paper analyzed active relationship among stratum information and all genetic signs and hydrody- namic factors in relevant sedimentary environment, and made research on logging facies, sedimentary microfacies and distribution and development of reservoir sand body, by which it is confirmed that the underwater distribution channel microfacies and channel overlying debouch bar microfacies of delta front subfacies could be regarded as the favorable facies for forming low permeability reservoir sand body, which can control the striking and distribution of sand body, while it has the characteristics of fine continuity, connectivity, and high thickness. Through the research on Chang332 reservoir sedimentary microfacies and favorable oil - bearing area prediction in studied area, it can be known that the reservoir lied in middle and southwest host facies of underwater distribution channel belongs to five water systems which developed from northwest to southeast, the favorable oil - bearing area reservoir which controlled and blocked out by favorable deposi-tional facies entirely characterized to be more upgrading from middle to southwest lower middle reaches. All of this can provide reliable foundation for future rolling and border expanding exploitation of the reservoir in this area.