【摘要】：直羅油田張村驛位于陜西省富縣境內(nèi),研究區(qū)面積約1000km2,構(gòu)造位置屬于鄂爾多斯盆地陜北斜坡東南部。過去其主要開發(fā)層位為長(zhǎng)2段,勘探程度及動(dòng)用程度均很高。近年來,長(zhǎng)8段的油氣勘探不斷有重大突破,許多井試油獲工業(yè)油流,展現(xiàn)了延長(zhǎng)組下組合具有廣闊的勘探潛力。因此延長(zhǎng)組下組合將成為今后直羅油田探明儲(chǔ)量增長(zhǎng)和原油上產(chǎn)的重要接替層位,開展此課題的研究對(duì)油田可持續(xù)發(fā)展意義重大。本文以石油地質(zhì)學(xué)、沉積巖石學(xué)和儲(chǔ)層地質(zhì)學(xué)等理論為指導(dǎo),以實(shí)驗(yàn)測(cè)試技術(shù)為依托,綜合應(yīng)用野外露頭、鉆井、測(cè)井及生產(chǎn)動(dòng)態(tài)資料,從沉積相和砂體展布研究入手,對(duì)長(zhǎng)8儲(chǔ)層的巖石學(xué)特征、物性特征、孔隙結(jié)構(gòu)特征、以及成巖作用進(jìn)行了研究和分析,取得了以下成果和認(rèn)識(shí)。根據(jù)野外露頭觀察、巖心觀察、沉積構(gòu)造及測(cè)井相分析表明,長(zhǎng)8期主要發(fā)育三角洲前緣亞相的水下分流河道、河道側(cè)翼及分流間灣微相。通過巖心描述及巖石薄片鑒定,認(rèn)為長(zhǎng)8段儲(chǔ)層的巖石類型主要為細(xì)-極細(xì)粒巖屑長(zhǎng)石砂巖和長(zhǎng)石砂巖,碎屑成分主要為石英、長(zhǎng)石、巖屑及少量填隙物,填隙物組分主要為綠泥石、伊利石、碳酸鹽礦物、硅質(zhì)及長(zhǎng)石質(zhì)膠結(jié)物等。砂巖的成分成熟度和結(jié)構(gòu)成熟度均較低。根據(jù)常規(guī)物性資料分析,得出長(zhǎng)8段為低孔低滲儲(chǔ)層,平均孔隙度為8.12%,平均滲透率為0.25×10-3μm2。根據(jù)巖石薄片、鑄體薄片、掃描電鏡等資料分析,認(rèn)為長(zhǎng)8儲(chǔ)層主要發(fā)育粒間溶孔、長(zhǎng)石溶孔、巖屑溶孔、填隙物內(nèi)溶孔及微裂隙。根據(jù)壓汞毛管壓力測(cè)試資料分析,發(fā)現(xiàn)長(zhǎng)8段孔喉分選性較差,喉道類型以細(xì)喉和微喉為主。通過巖石鑄體薄片觀察、掃描電鏡及X射線衍射等測(cè)試技術(shù)分析,認(rèn)為研究區(qū)成巖作用類型主要為機(jī)械壓實(shí)作用、膠結(jié)作用、交代作用、溶蝕作用和破裂作用。根據(jù)鏡質(zhì)體反射率(Ro)、有機(jī)質(zhì)成熟度、I/S中的S%、石英加大級(jí)別、顆粒接觸類型、孔隙類型等指標(biāo)綜合判斷認(rèn)為,研究區(qū)長(zhǎng)8處于中成巖階段B期。根據(jù)儲(chǔ)層分類標(biāo)準(zhǔn),本文將研究區(qū)長(zhǎng)8儲(chǔ)層分為四類:Ⅰ類優(yōu)質(zhì)儲(chǔ)層、Ⅱ類中等儲(chǔ)層、Ⅲ類差儲(chǔ)層、Ⅳ類致密儲(chǔ)層,并從多個(gè)角度對(duì)長(zhǎng)8儲(chǔ)層進(jìn)行了對(duì)比及評(píng)價(jià)。
[Abstract]:Zhangcuyi Oilfield is located in Fuxian County, Shaanxi Province, with an area of about 1000km2. The tectonic location belongs to the southeast of North Shaanxi Slope in Ordos Basin. In the past, the main development horizon was Chang 2, and the degree of exploration and production was very high. In recent years, great breakthroughs have been made in oil and gas exploration in Chang 8, and many wells have been tested for industrial oil flow, which shows that the lower assemblage of Yanchang formation has broad exploration potential. Therefore, the Yanchang formation combination will become an important replacement horizon for proven reserves growth and crude oil production in Zhiluo Oilfield in the future, and it is of great significance to carry out the research on this subject for the sustainable development of the oilfield. Guided by the theories of petroleum geology, sedimentary petrology and reservoir geology, and relying on the experimental test technology, this paper comprehensively applies field outcrop, drilling, logging and production dynamic data to study the distribution of sedimentary facies and sand bodies. The petrological characteristics, physical properties, pore structure characteristics and diagenesis of Chang 8 reservoir are studied and analyzed. According to field outcrop observation, core observation, sedimentary structure and log facies analysis, the main subfacies of delta front subfacies, channel flanking and interdistributary bay microfacies were developed in Chang8 period. The rock types of Chang 8 reservoir are mainly fine-very fine-grained lithic feldspar sandstone and feldspar sandstone, and the clastic components are mainly quartz, feldspar, lithic debris and a small amount of interstitial matter. The interstices are mainly chlorite, Illite, carbonate minerals, siliceous and feldspar cements. The composition maturity and structure maturity of sandstone are low. Based on the analysis of conventional physical properties, it is concluded that Chang 8 is a low porosity and low permeability reservoir with an average porosity of 8.12 and an average permeability of 0.25 脳 10 ~ (-3) 渭 m ~ (2). According to the data analysis of rock slice, cast slice and scanning electron microscope, it is concluded that intergranular dissolved pore, feldspar dissolved pore, cuttings dissolved pore, dissolving pore and microfissure are mainly developed in Chang 8 reservoir. According to the analysis of pressure test data of mercuric capillary, it is found that the separation of pore throat in long 8 section is poor, and the throat types are mainly fine throat and microlarynx. Based on the observation of thin section of rock cast, SEM and X-ray diffraction, it is concluded that the diagenesis types in the study area are mainly mechanical compaction, cementation, metasomatism, dissolution and rupture. According to the Synthetical judgement of vitrinite reflectance (Ro),) organic matter maturity in I / S, quartz increasing grade, particle contact type, pore type and so on, the study area Chang 8 is in stage B of middle diagenesis. According to the criteria of reservoir classification, this paper classifies Chang8 reservoir into four categories: I type high quality reservoir, 鈪，

本文編號(hào)：2184665