安塞油田长6油层组精细地层划分与对比

Fine strata classification and correlation of Chang 6 oil-bearing formation of Yanchang Formation in Ansai Oilfield

目的 在油田开发中、后期,为研究砂体展布、沉积微相、储层非均质性以及最终预测有利含油区块提供基础数据。方法 利用测井曲线和岩心资料,分析了研究区近200口探井长6油层组的岩、电特征,对安塞油田延长组长6油层组进行了精细划分与对比,并利用该成果分析了长61-21小层的沉积微相及砂体展布特点。结果 长6油层组自上而下划分为长61-11、长61-21、长1、长61-3621、长62和长63等6个不同级别的小层,各小层厚度不等;其中,长61-21小层砂体发育,属水下分流河道微相,为安塞油田延长组长6油层组的主力产层。结论 长6油层组精细地层划分与对比对油田开发具有重要意义。

Aim The fine strata classification and correlation can provide basic data that is the key in studying the distribution of sandbodies, the characteristics of sedimentary microfacies and the heterogeneity of reservoirs in Chang 6 oil-bearing formation of Yanchang Formation in Ansai Oilfield during the development stage.Methods On the basis of well logs and core data, the characteristics of the rock-electricity in the 200 wells have been analyzed.The fine strata classification and correlation in Chang 6 oil-bearing formation of Yanchang Formation in Ansai Oilfield have been completed. And by application of the result,the characteristics of sedimentary microfacies and sandbodies in Chang 6^(1-2)_1 have been analyzed.Results From the upper to lower, Chang 6 oil-bearing formation can be divided into Chang 6^(1-1)_1, Chang 6^(1-2)_1, Chang 6^(1-3)_1, Chang 6~2_1, Chang 6_2 and Chang 6_3. The thickness in every fine strata is different. Among them, Chang 6^(1-2)_1 has abundant sandbodies. The distributary channel microfacies deposits in Chang 6^(1-2)_1 become the dominated reservoirs in Ansai Oilfield.Conclusion The fine strata classification and correlation of Chang 6 oil-bearing formation has a deep significance to the development of the Oilfield.