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洛带气田遂宁组属于浅水三角洲沉积,沉积主体以三角洲前缘沉积为主。运用地震资料精细标定及识别砂层组,结合多井测井曲线解释成果,建立砂体对比格架,运用井震资料互馈结合,一致性对比的原则,开展砂体对比,分析遂宁组Jsn_1~(1-2)砂组的沉积微相展布及砂体对比情况。研究结果表明,洛带气田遂宁组Jsn_1~(1-2)砂组处于三角洲前缘亚相,沉积微相有水下分流河道、分流间湾、河口坝、水下决口扇,遂宁组Jsn_1~(1-2)组有10条分流河道,分布不均匀,决口扇位于分流河道的两侧,河口砂坝出现在分流河道末端。砂体的展布明显受控于沉积微相,分流河道微相砂体厚度较厚,河口砂坝与决口扇微相砂体厚度较薄。该方法对横向变化快、砂体对比难度大的储层研究有着重要的意义。
The Suining Formation of Luodai gas field belongs to the shallow water delta deposit, and the sedimentary body is mainly delta front deposit. Using the seismic data to finely calibrate and identify the sand group, combined with multi-well logging curve interpretation results, the establishment of sand body comparison frame, the use of seismic data mutual feedback, the principle of consistency and contrast, sand body comparison, analysis of Suining group Jsn_1 Sedimentary microfacies distribution of ~ (1-2) sand group and comparison of sand bodies. The results show that the Jsn_1 ~ (1-2) sand group of Suining Formation in Luodai gas field is in the delta front facies subfacies, and the sedimentary microfacies are underwater distributary channel, shunt bay, estuarine dam, (1-2) There are 10 distributary channels in the group with uneven distribution. The outlet fan is located on both sides of the distributary channel, and the estuary sand bar appears at the end of the distributary channel. The distribution of sand body is obviously controlled by the sedimentary microfacies. The thicknesses of distributary channel microfacies sand body are relatively thick, and the thicknesses of estuarine sand bar and buccal fractured sand body are thinner. This method is of great significance for the study of reservoirs with rapid horizontal variation and relatively difficult sand bodies.