西部凹陷中南部潜山储层特征研究

发布时间：2018-11-05 16:23

【摘要】：研究工区位于西部凹陷西斜坡的中南部位,西起西斜坡下台阶,东至清水洼陷。西斜坡潜山仅在欢喜岭、齐家、杜家台山、胜利塘、曙光潜山预测探明石油地质储量,多集中在中、高潜山带上,而对于深层潜山及已探明潜山的内幕深层存在储量空白区,西部凹陷中南部古近系勘探程度较高,古近系有利目标寻找和落实的难度日益增大,而潜山勘探程度相对较低,有利勘探面积大,西部凹陷中南部潜山层系多样,既有太古宇、元古界,又有中生界。油藏类型多样,有侵蚀残山型油藏和断块山型油藏,不同时期及不同类型的潜山成藏条件不同。由于西斜坡潜山油藏类型不同,形成条件多样,岩性变化的复杂性,油气水分布的难以确定,影响着西部凹陷的潜山勘探进程。本论文的开展是以构造解释为主,成藏条件分析为辅,在构造解释中综合利用了测井、地震、钻井及分析化验等资料,进行精细的构造解释和储层特征的分析,通过构建贯穿工区东西南北的几条地质剖面,建立地震解释的宏观格架,通过测井标定及VSP确定中深层的潜山顶界面,在井间及缺少井的地区,以地震的预测为主,并结合属性分析共同确定。通过构造演化及断层生长指数的分析,认为潜山圈闭在第三系前形成雏形,主成长期为沙四期,定型于沙三期。有利目标区圈闭受早期断裂的有利改造,不受晚期断裂的影响。在储层条件分析中,深大的断裂,充足的油源及潜山内幕的隔层为潜山内幕的成藏成为可能。结合前人的认识分析研究区的变质岩的岩性类型,确定预测的潜山的岩性为混合花岗岩和片麻岩在优势岩性序列中较辉绿岩及角闪岩具有一定的成藏优势,裂缝是潜山及内幕成藏的关键,通过临井资料的分析,认为本研究区的裂缝相对较发育,易于形成裂缝式储层,潜山的上覆的砂三及砂四段地层厚度大,泥岩发育,可作为本区域的盖层,同时也可以作为研究区域有利的烃源岩。优选的目标在马南潜山区,根据以前的资料的对供油窗口的讨论,在提出的目标区中存在较大的供烃幅度,利于目标区的成藏。根据本区的成藏类型及所处的位置,划分为两种成藏模式,理论上讨论了有利目标的成藏的可能性。最后对目标区进行了烃类检测,辅助分析目标区潜山风化壳及内幕的成藏具有一定的效果。综合以上的研究,总结研究区潜山油藏特征及分析油气成藏控制因素,划分潜山油藏类型,确定潜山成藏模式；落实潜山构造形态及断裂展布,搞清潜山岩性组合、分布以及储层控制因素,确定潜山与有效烃源岩的接触关系,从而优选有利目标,提出建议井位。
[Abstract]:The study area is located in the central and southern part of the west slope of the western sag, rising from the west slope to the lower steps, and from the east to the clear water sag. The buried hills on the west slope are only located in Huanxiling, Qijia, Dujiatai, Shengtang and Shuguang buried hills to predict the proven oil geological reserves, most of which are concentrated in the middle and high buried hill zones, but there are blank areas in the deep buried hills and the deep layers of the proven buried hills. The exploration degree of Paleogene in the central and southern part of the western sag is relatively high, and the difficulty of finding and implementing the favorable targets of the Paleogene is increasing day by day, while the exploration degree of buried hill is relatively low, and the favorable exploration area is large. The Proterozoic and Mesozoic. There are various types of reservoirs, including eroded residual mountain reservoirs and fault-block mountain reservoirs, and different reservoir forming conditions of buried hill in different periods and types. Because of the different types of buried hill reservoirs on the west slope, various formation conditions, complexity of lithologic changes and difficulty in determining the distribution of oil, gas and water, the process of buried hill exploration in the western sag is affected. The development of this paper is based on structural interpretation, supplemented by reservoir forming condition analysis. In the structural interpretation, comprehensive use of logging, seismic, drilling and analysis of laboratory data, for fine structural interpretation and reservoir characteristics analysis, By constructing several geological sections running through the north and south of the east, west and east of the working area, establishing the macroscopic frame of seismic interpretation, and determining the top interface of the buried hill in the middle and deep layers by logging calibration and VSP, earthquake prediction is the main factor in the cross-well area and the area where the wells are lacking. And combined with attribute analysis to determine. Based on the analysis of tectonic evolution and fault growth index, it is considered that buried hill traps formed embryonic form before Tertiary system, and the main growth period is the fourth stage of sand, which is fixed in the third stage of sand. The traps in favorable target areas are not affected by late faults but by the favorable transformation of early faults. In the analysis of reservoir conditions, it is possible that the deep fault, sufficient oil source and the interlayer of buried hill interior are the accumulation of buried hill insider. In combination with the previous understanding and analysis of the lithologic types of metamorphic rocks in the study area, it is determined that the predicted lithology of buried hills is migmatite and gneiss, which has a certain predominance over diabase and amphibolite in the dominant lithologic sequence. Fracture is the key of buried hill and inside reservoir formation. By analyzing the data of adjacent wells, it is considered that the fractures in this research area are relatively developed and easy to form fractured reservoirs, and the overlying sand 3 and sand 4 member of buried hill have large formation thickness and mudstone development. It can be used as the caprock in the region and as a favorable source rock in the study area. The target of optimal selection is in Manan buried hill area. According to the discussion of oil supply window of previous data, there is a large range of hydrocarbon supply in the proposed target area, which is conducive to the formation of reservoir in the target area. According to the type and location of reservoir formation in this area, two types of reservoir forming models are divided, and the possibility of reservoir formation of favorable target is discussed theoretically. Finally, hydrocarbon detection is carried out in the target area, and it is effective to analyze the accumulation of weathering crust and inside of buried hill in the target area. Based on the above studies, the characteristics of buried hill reservoirs in the study area are summarized and the controlling factors of hydrocarbon accumulation are analyzed, the types of buried hill reservoirs are classified, and the model of buried hill reservoir formation is determined. The structural morphology and fault distribution of buried hill are carried out, lithologic assemblages, distribution and reservoir control factors of buried hill are made clear, the contact relationship between buried hill and effective source rock is determined, so as to select favorable target and propose well location.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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