【摘要】：王集油田構(gòu)造位置處于泌陽(yáng)凹陷北部斜坡帶的中部,構(gòu)造復(fù)雜,總體上為向東南傾沒(méi)且形態(tài)較為寬緩的鼻狀構(gòu)造,區(qū)域內(nèi)發(fā)育北東向和北北東向9條正斷層,整個(gè)區(qū)域在構(gòu)造格局上形成了西南逐漸向東北抬升的斷階構(gòu)造。王集油田是1977年開(kāi)始勘探開(kāi)發(fā)工作的復(fù)雜斷塊油藏,1990年開(kāi)始進(jìn)行注水開(kāi)發(fā),目前采用的是不規(guī)則井網(wǎng)注水開(kāi)發(fā),含水率高達(dá)94.7%,高含水期階段縱向和平面非均質(zhì)嚴(yán)重,層間矛盾更加突出,沒(méi)有動(dòng)用的剩余油更加分散、破碎,水油比增長(zhǎng)快,水驅(qū)油效率低。因此,開(kāi)展儲(chǔ)層沉積特征、砂體展布、沉積微相展布等研究,為王集油田復(fù)雜小斷塊高含水油藏的注采產(chǎn)液結(jié)構(gòu)調(diào)整、注采井網(wǎng)適應(yīng)性分析和調(diào)整方案優(yōu)化奠定堅(jiān)實(shí)的基礎(chǔ)。本次綜合應(yīng)用鉆井、測(cè)井、取心及錄井資料；通過(guò)巖心觀察確定本區(qū)的巖石成分、結(jié)構(gòu)、構(gòu)造,并根據(jù)泌陽(yáng)凹陷核三段地層巖石學(xué)特征確定巖石相類(lèi)型；用巖心相分析結(jié)果結(jié)合測(cè)井相后進(jìn)行單井相分析,并推廣至所有井,未取心井測(cè)井相分析參考了錄井資料；在對(duì)研究區(qū)地層進(jìn)行精細(xì)對(duì)比劃分的基礎(chǔ)上,對(duì)研究區(qū)構(gòu)造,特別是對(duì)油水分布規(guī)律有影響的小斷層有新的發(fā)現(xiàn)；根據(jù)巖心觀察、試油等資料所證實(shí)的巖石類(lèi)型,分析異常巖電響應(yīng)特征巖石產(chǎn)生的地質(zhì)因素,探索出識(shí)別這類(lèi)巖石的識(shí)別方法,為本區(qū)砂泥巖準(zhǔn)確識(shí)別奠定了基礎(chǔ)。由于研究區(qū)面積小、具有近源、淺水快速沉積環(huán)境等特點(diǎn),因此,本次沉積相研究過(guò)程中,以取心獲得的巖石學(xué)資料為基礎(chǔ),應(yīng)用測(cè)井相分析精細(xì)刻畫(huà),綜合各方面資料,認(rèn)識(shí)到研究區(qū)目的層段沉積相以三角洲前緣亞相為主。通過(guò)細(xì)致的研究,得出以下認(rèn)識(shí)：王集油田東區(qū)由相對(duì)近源的粒度較粗的侯莊辮狀河三角洲沉積物組成。以較粗的砂礫巖和粉細(xì)砂巖為主,主要巖性包括頁(yè)巖、泥巖、砂質(zhì)泥巖、泥質(zhì)粉砂巖、細(xì)砂巖、粉砂巖、中砂巖、粗砂巖、礫巖和砂礫巖等。巖石類(lèi)型主要為長(zhǎng)石砂巖和巖屑長(zhǎng)石砂巖為主,也有部分巖屑砂巖和長(zhǎng)石巖屑砂巖。構(gòu)造研究認(rèn)為王集油田主要斷層數(shù)量、位置與前人研究結(jié)果基本一致,斷層的走向與傾向大多繼承了前人研究成果。儲(chǔ)層砂體粒度為典型的牽引流搬運(yùn)沉積。粒度累積概率曲線可歸納為近一段式、上拱兩段式和多段式三種,主要發(fā)育平行層理、波狀層理、交錯(cuò)層理等牽引流沉積成因的沉積構(gòu)造。綜合上述研究,再結(jié)合測(cè)井相研究成果,認(rèn)為研究區(qū)核三段地層屬三角洲沉積體系,亞相主要屬三角洲前緣,沉積微相主要為水下分流河道、河口壩、席狀砂、河道問(wèn)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.
【學(xué)位授予單位】：長(zhǎng)江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P618.13

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