王集油田东区核三段沉积相研究

发布时间：2018-09-18 18:03

【摘要】：王集油田构造位置处于泌阳凹陷北部斜坡带的中部,构造复杂,总体上为向东南倾没且形态较为宽缓的鼻状构造,区域内发育北东向和北北东向9条正断层,整个区域在构造格局上形成了西南逐渐向东北抬升的断阶构造。王集油田是1977年开始勘探开发工作的复杂断块油藏,1990年开始进行注水开发,目前采用的是不规则井网注水开发,含水率高达94.7%,高含水期阶段纵向和平面非均质严重,层间矛盾更加突出,没有动用的剩余油更加分散、破碎,水油比增长快,水驱油效率低。因此,开展储层沉积特征、砂体展布、沉积微相展布等研究,为王集油田复杂小断块高含水油藏的注采产液结构调整、注采井网适应性分析和调整方案优化奠定坚实的基础。本次综合应用钻井、测井、取心及录井资料；通过岩心观察确定本区的岩石成分、结构、构造,并根据泌阳凹陷核三段地层岩石学特征确定岩石相类型；用岩心相分析结果结合测井相后进行单井相分析,并推广至所有井,未取心井测井相分析参考了录井资料；在对研究区地层进行精细对比划分的基础上,对研究区构造,特别是对油水分布规律有影响的小断层有新的发现；根据岩心观察、试油等资料所证实的岩石类型,分析异常岩电响应特征岩石产生的地质因素,探索出识别这类岩石的识别方法,为本区砂泥岩准确识别奠定了基础。由于研究区面积小、具有近源、浅水快速沉积环境等特点,因此,本次沉积相研究过程中,以取心获得的岩石学资料为基础,应用测井相分析精细刻画,综合各方面资料,认识到研究区目的层段沉积相以三角洲前缘亚相为主。通过细致的研究,得出以下认识：王集油田东区由相对近源的粒度较粗的侯庄辫状河三角洲沉积物组成。以较粗的砂砾岩和粉细砂岩为主,主要岩性包括页岩、泥岩、砂质泥岩、泥质粉砂岩、细砂岩、粉砂岩、中砂岩、粗砂岩、砾岩和砂砾岩等。岩石类型主要为长石砂岩和岩屑长石砂岩为主,也有部分岩屑砂岩和长石岩屑砂岩。构造研究认为王集油田主要断层数量、位置与前人研究结果基本一致,断层的走向与倾向大多继承了前人研究成果。储层砂体粒度为典型的牵引流搬运沉积。粒度累积概率曲线可归纳为近一段式、上拱两段式和多段式三种,主要发育平行层理、波状层理、交错层理等牵引流沉积成因的沉积构造。综合上述研究,再结合测井相研究成果,认为研究区核三段地层属三角洲沉积体系,亚相主要属三角洲前缘,沉积微相主要为水下分流河道、河口坝、席状砂、河道问和湖相。
[Abstract]:The structural location of Wangji Oilfield is located in the middle of the northern slope zone of Biyang Sag. The structure is complex, and the structure is generally a broad and gentle nose structure with a southeastward dip. Nine normal faults are developed in the region, and there are 9 normal faults in the NNE direction and NNE direction in the region. The fault terrace structure gradually uplifted from southwest to northeast in the whole area. Wangji Oilfield is a complex fault-block reservoir that began exploration and development in 1977. It began to develop by water injection in 1990. At present, irregular well pattern is used for waterflooding development. The water cut is as high as 94.7.The vertical and plane heterogeneity in high water-cut period is serious. The interlayer contradiction is more prominent, the remaining oil is more dispersed and broken, the water / oil ratio increases faster, and the efficiency of water flooding is low. Therefore, the research on reservoir sedimentary characteristics, sand body distribution and sedimentary microfacies distribution lays a solid foundation for the adjustment of injection-production structure, adaptability analysis of injection-production pattern and optimization of adjustment scheme for high water cut reservoirs with complex small fault blocks in Wangji Oilfield. The comprehensive application of drilling, logging, coring and logging data, through core observation to determine the rock composition, structure, and according to the petrological characteristics of the third member of Biyang sag to determine the lithofacies type; The results of core facies analysis combined with logging facies were applied to single well facies analysis, which was extended to all wells. The log facies analysis of unfetched wells referred to logging data. On the basis of fine correlation and division of strata in the study area, the structure of the study area was studied. In particular, new discoveries have been made on small faults that have an effect on the distribution of oil and water. According to the rock types confirmed by core observation and oil testing data, the geological factors of the rock produced by the electrical response characteristics of abnormal rocks are analyzed. The identification method of this kind of rock is explored, which lays a foundation for the accurate recognition of sand and mudstone in this area. Because the study area is small, has the characteristics of near source and shallow water rapid deposition environment, therefore, in the course of the sedimentary facies study, based on the petrological data obtained by coring, the well logging facies analysis is used to analyze the fine description and synthesize all aspects of the data. It is recognized that delta front subfacies are the main sedimentary facies of the target formation in the study area. Through careful study, the following conclusions can be drawn: the eastern part of Wangji Oilfield is composed of relatively coarse-grained Houzhuang braided river delta sediments. The main lithology includes shale, mudstone, sandy mudstone, argillaceous siltstone, fine sandstone, siltstone, medium sandstone, coarse sandstone, conglomerate and sandy gravel. The main rock types are feldspathic sandstone and lithic feldspathic sandstone, as well as some lithic sandstone and feldspathic lithic sandstone. It is believed that the number and location of the main faults in Wangji Oilfield are consistent with those of previous studies, and the strike and tendency of faults are mostly inherited from previous studies. The grain size of reservoir sand body is a typical tractive flow transport deposit. The cumulative probability curve of grain size can be divided into three types, namely, one segment, two sections and more than one arch, which are mainly composed of parallel bedding, wave-like bedding, staggered bedding, and other sedimentary structures of traction flow sedimentary origin, such as parallel bedding, wave-like bedding and staggered bedding. Based on the above studies and the results of well logging, it is considered that the third member of the nuclear formation in the study area belongs to delta sedimentary system, the subfacies is mainly delta front, and the sedimentary microfacies are mainly subaqueous distributary channel, estuarine bar, sheet sand, river channel and lacustrine facies.
【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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