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通过泌阳断陷双河—赵凹地区的取芯井资料,对下第三系核三上段S5层序各体系域作了单井相分析,确定了各种沉积微相类型的测井响应特征,据此进行了联井剖面相分析,进而确定了各种微相的纵横向变化规律及其组合关系。结合各体系域砂砾岩(或泥质岩)等厚度图或砂泥比等值线图(砂体密度图)进行了平面相分析,研究了各体系域沉积微相的平面展布特征。研究区S5层序油气最有利的体系域为TST,其次为HST和RST。在TST中,最有利相带为河口砂坝和水下分流河道,其次为前缘席状砂和滑塌性重力流扇,而分流河道较差。在综合研究的基础上,对研究区S5层序TST提出了三个油气有利区块,并进行分析与评价。
Through the coring well data in the Shuanghe-Zhaoqiu area, Biyang depression, single-well facies analysis was carried out for each system tract in the S5 sequence of the upper third member of the Lower Tertiary. Well logging responses of various sedimentary microfacies types were determined According to this, the cross-section analysis of wellbore is carried out, and then the vertical and horizontal variation of various micro-facies and their combination are determined. Combining the thickness maps of sandstone and conglomerate (or argillaceous) and the contour maps of sand and sand (sand density map), the planar facies analysis was carried out and the plane distribution characteristics of sedimentary microfacies of each system tract were studied. The most favorable system tract of S5 oil and gas in the study area is TST, followed by HST and RST. In TST, the most favorable facies belts are estuarine sand bar and underwater distributary channel, followed by sanding sand and slump gravity flow fan, while the distributary channel is poor. On the basis of the comprehensive study, three favorable blocks of oil and gas are proposed for the S5 sequence TST in the study area, and analyzed and evaluated.