塔河油田九区白垩系舒善河组岩性圈闭识别与评价

发布时间：2018-10-30 20:46

【摘要】：塔河油田位于新疆塔里木盆地东北部。目前,对于塔河油田的碎屑岩油气勘探开发已经进入中后期阶段,勘探目标从大型的构造圈闭逐渐转向小规模的岩性圈闭。随着近些年来对T903井区岩性油气藏勘探的突破,引起了西北局对塔河油田九区白垩系舒善河组的重视。白垩系舒善河组的岩性圈闭勘探程度还比较低,目前所掌握的资料比较少,有很多问题都阻碍着舒善河组油气勘探。论文研究的主要层系为白垩系舒善河组。通过对测井曲线、地震资料的分析,在高分辨率层序地层学理论指导下,进行长期、中期、短期旋回基准面的识别,将白垩系舒善河组划分为1个长期旋回(KLSC1)、3个中期旋回(KMSC1~KMSC3)以及若干个短期旋回,并在此基础上建立了等时地层格架。在等时地层格架约束下,进行砂体和沉积相的横纵向展布特征研究。舒善河组KMSC1旋回主要为辫状河三角洲前缘亚相,微相为水下分流河道及分流间湾,主要发育水下分流河道砂体,砂体连续性好,测井解释含油气层主要集中在该旋回上部小层(2号砂层组和3号砂层组);舒善河组KMSC2旋回主要为滨浅湖亚相,微相为浅湖泥及砂坝,主要发育砂坝砂体,在平面上呈块状分布,横向上砂体不连续。但测井解释油气显示良好,主要集中在旋回的下部小层(4号砂层组和5号砂层组)。舒善河组KMSC3旋回主要为辫状河三角洲前缘亚相,微相为为水下分流河道及分流间湾,砂体发育且连续性较好,但没有油气显示。通过对提取的多种地震属性进行反复的对比分析,发现平均绝对振幅属性能很好的反映出砂泥的分布情况。在此基础上,对井点处的属性值以及与之对应目的层段的实钻砂体厚度进行统计,进行相关性分析,可以得到一定的相关性,能够大致弄清砂体的展布情况。研究区内常规的波阻抗反演剖面不能够很好的区分砂岩和泥岩,运用拟声波反演可以很好的识别8m以上的砂体。在九区白垩系舒善河组KMSC1~KMSC2旋回小层里共识别出11个圈闭,其中8个岩性圈闭,3个构造-岩性圈闭。根据砂体的发育情况、盖层封堵性、含油气性、与油源的连通情况综合考虑,优选出1个有利圈闭。
[Abstract]:Tahe Oilfield is located in the northeast of Tarim Basin, Xinjiang. At present, the exploration and development of clastic rocks in Tahe Oilfield has entered the middle and late stage, and the exploration targets have gradually shifted from large structural traps to small scale lithologic traps. With the breakthrough of lithologic reservoir exploration in T903 well area in recent years, attention has been paid to the Cretaceous Shushanhe formation in Tahe Oilfield. The lithologic trap exploration degree of the Cretaceous Shushanhe formation is still relatively low, and the information available at present is relatively few, there are many problems which hinder the oil and gas exploration of the Shushanhe formation. The main layer studied in this paper is the Cretaceous Shushanhe formation. Based on the analysis of logging curves and seismic data and under the guidance of high resolution sequence stratigraphy theory, the long, medium and short term cycle datum levels are identified, and the Cretaceous Shushanhe formation is divided into a long term cycle (KLSC1). On the basis of three KMSC1~KMSC3 and several short term cycles, isochronous stratigraphic framework has been established. The transverse and longitudinal distribution characteristics of sand bodies and sedimentary facies are studied under the constraints of isochronous stratigraphic framework. The KMSC1 cycle of the Shushanhe formation is mainly braided delta front subfacies, the microfacies is the underwater distributary channel and the interdistributary bay, the sand body of the underwater distributary channel is mainly developed, and the sand body has good continuity. Log interpretation of oil-bearing gas reservoirs mainly concentrated in the upper sublayer of the cycle (No. 2 sand formation and No. 3 sand formation); The KMSC2 cycle of Shushanhe formation is mainly composed of shallow lacustrine subfacies, and the microfacies is shallow lake mud and sand dam. But the oil and gas interpretation of logging shows well, mainly in the lower sublayer of the cycle (4 sand formation and 5 sand formation). The KMSC3 cycle of Shushanhe formation is mainly braided river delta front subfacies, while the microfacies is underwater distributary channel and interdistributary bay, sand body is developed and continuity is good, but there is no oil and gas show. Through repeated comparison and analysis of various seismic attributes extracted, it is found that the average absolute amplitude attribute can well reflect the distribution of sand and mud. On this basis, the property values at the well point and the thickness of the solid sand body corresponding to the target layer are statistically analyzed, and the correlation can be obtained, and the distribution of the sand body can be roughly clarified. The conventional wave impedance inversion section in the study area can not distinguish sandstone and mudstone well. Using pseudo acoustic inversion can identify sand bodies over 8 m. A total of 11 traps were identified in the KMSC1~KMSC2 sublayer of the Cretaceous Shushanhe formation in the Jiulong area, including 8 lithologic traps and 3 tectonic-lithologic traps. According to the development of sand body, sealing property of caprock, oil and gas content and connection with oil source, a favorable trap is selected.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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