吐哈盆地葡萄沟—葡北侏罗系低幅度构造识别及储层预测

发布时间：2018-10-15 08:04

【摘要】：葡萄沟-葡北地区位于吐哈盆地台北凹陷西部,七克台组一段与三间房组三段储层较为发育,油气资源丰富。受多期构造运动影响,断裂极为发育,逆掩推覆构造带形成多个中小型断背斜,局部地区发育低幅度构造。当前多数规模较大的背斜构造均已上钻,且多数井取得工业油流,而低幅度构造的勘探程度较低,因此低幅度构造区域极具勘探前景。随着探区勘探程度的提高,葡萄沟-葡北地区的构造特征认识得以不断深入。经钻探后发现,低幅构造高点位置与先前认知存在-定的偏差,最初上钻的探井位置大多未能落在高点上,并且还存在部分遗漏的低幅度构造未能识别出来。因此,急需明确该地区相对合理的构造特征,识别低幅度构造。本次研究以葡萄沟-葡北地区连片三维地震资料为基础,对第三系至侏罗系的主要目的层进行精细解释、断裂发育特征研究,并针对油气主要产层进行储层预测。在对第三系至侏罗系井下地层划分与地震层位综合标定的基础上,建立葡萄沟一葡北地区主要目的层地震地质层序格架与地震地质解释方案,查明研究区主要构造形态。为了更准确识别低幅度构造,采用正演模拟技术对小断层与微起伏构造分辨率进行研究,分析不同影响因素对低幅度构造识别的影响。针对小断层的识别,采用属性融合的方式指导、验证小断层解释方案的可靠性。关于微起伏构造,将横向高分辨率的速度谱资料与纵向高分辨率的井资料有机结合,重构侏罗系主要目的层平均速度场,进行变速成图,并与早期时深关系拟合法时深转换构造图进行对比,综合利用倾角测井资料、正演模拟技术以及古地貌恢复手段,对变速成图的结果进行验证。依据变速成图法,七克台组一段底界新发现微起伏构造2个,三间房组二段底界新发现微起伏构造3个,修正先前七克台组一段底界构造误区2处,修正三间房组二段底界构造误区3处。通过波阻抗反演、属性分析和流体检测技术对主要层段进行储层预测,寻找有利的低幅度构造储层。为葡萄沟-葡北地区油气藏的不断发现提供重要的理论依据,同时,对于提高油气勘探效益具有较大的实际意义。
[Abstract]:The Gougou-Pubei area is located in the west of Taibei depression of Turpan-Hami Basin. The reservoirs of the first member of Qiketai formation and the third member of Sanjianfang formation are relatively developed and rich in oil and gas resources. Under the influence of multi-stage tectonic movement, the faults are extremely developed, the overthrust tectonic belts form several small and medium-sized fault backs, and the low-amplitude structures are developed in some areas. At present, most of the large anticline structures have been drilled, and most wells have obtained industrial oil flow, but the exploration degree of low amplitude structure is relatively low, so the low amplitude structure area has great prospect for exploration. With the improvement of exploration degree in the exploration area, the understanding of the structural characteristics of the Gougou-Pubei area has been deepened. After drilling, it is found that the deviation between the location of the high point of the low amplitude structure and that of the prior cognition exists-fixed, the location of the exploratory well initially drilled fails to fall on the high point, and there are still some missing low-amplitude structures that have not been recognized. Therefore, it is urgent to identify the relatively reasonable structural characteristics and identify low amplitude structures in this area. Based on the 3D seismic data of the continuous segment in the Gougou and Pubei area, the main target layers from Tertiary to Jurassic are carefully interpreted, the characteristics of fault development are studied, and the reservoir prediction is carried out for the main oil and gas producing zones. On the basis of the classification of downhole strata from Tertiary to Jurassic and the comprehensive calibration of seismic layers, the seismogeological sequence framework and seismic geological interpretation scheme of the main target layers in the Gougou and Pubei area are established, and the main structural forms in the study area are found out. In order to identify the low-amplitude structure more accurately, the resolution of small fault and micro-fluctuation structure was studied by forward modeling technique, and the influence of different factors on low-amplitude structure identification was analyzed. The method of attribute fusion is used to verify the reliability of the interpretation scheme for small faults. Regarding the micro-undulating structure, the horizontal high resolution velocity spectrum data and the vertical high resolution well data are combined organically to reconstruct the average velocity field of the main target layer of the Jurassic system, and the variable velocity mapping is carried out. The results of variable velocity mapping are verified by using dip logging data, forward modeling technology and paleogeomorphological restoration method. According to the method of variable velocity mapping, two new micro-undulating structures were found in the bottom boundary of the first section of Qiketai formation, and three new micro-undulating structures were found in the bottom boundary of the second member of the Sanjianfang formation, and 2 misunderstandings of the bottom boundary structure of the first section of the Qiketai formation were corrected. To correct 3 mistakes in the bottom boundary structure of the second stage of Sanjianfang formation. Through wave impedance inversion, attribute analysis and fluid detection techniques, the reservoir of the main formation is predicted to find favorable low-amplitude structural reservoir. It provides an important theoretical basis for the continuous discovery of oil and gas reservoirs in the Gougou and northern Portugal area and has great practical significance for improving the efficiency of oil and gas exploration.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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