本文選題：鄂爾多斯盆地 + 蘇14井區(qū)�。� 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：蘇14井區(qū)是蘇里格氣田重要的資源勘探區(qū)域,主要的產(chǎn)氣層為下石盒子組盒8段,儲(chǔ)集砂體為大型緩坡淺水河流相三角洲沉積,三角洲砂體分布廣泛,但砂體橫向分布極不連續(xù),縱向相互疊置,含氣砂巖難以識(shí)別,含氣范圍定量標(biāo)準(zhǔn)不易確定,儲(chǔ)層非均質(zhì)性強(qiáng),嚴(yán)重影響了該地區(qū)天然氣開發(fā)效果�；谏鲜鰡栴},本論文在前人研究基礎(chǔ)上,通過巖心觀察、地球物理測(cè)井資料、地震資料及地球化學(xué)資料分析,運(yùn)用沉積學(xué)、儲(chǔ)層地質(zhì)學(xué)、石油地質(zhì)學(xué)等理論方法為指導(dǎo),系統(tǒng)的研究了蘇14井區(qū)盒8段砂體的沉積微相及儲(chǔ)層宏觀非均質(zhì)性特征,通過精細(xì)描述砂體規(guī)模、縱向疊置關(guān)系、橫向展布特征和儲(chǔ)層的空間變化規(guī)律,取得了以下幾點(diǎn)認(rèn)識(shí):(1)綜合巖石顏色、巖石結(jié)構(gòu)、構(gòu)造和古生物及地球化學(xué)古鹽度的研究?jī)?nèi)容,推測(cè)盒8段為季節(jié)性干旱的陸相-海陸過渡相的淺水河流沉積環(huán)境。依據(jù)剖面結(jié)構(gòu)和測(cè)井相、地震相標(biāo)志,認(rèn)為MSC1-MSC3中期旋回發(fā)育辮狀河的三角洲平原沉積,沉積微相為分流河道和分流間洼地;MSC4中期旋回發(fā)育曲流河的三角洲平原沉積,沉積微相為天然堤、決口扇、分流河道、分流間洼地。(2)MSCI、MSC2中期旋回砂體為多期辮狀分流河道的疊置,厚度大,砂體在平面上呈毯式近南北向大面積展布;MSC3中期旋回砂體延伸規(guī)模較小,厚度較薄,平面砂體帶寬度較MSCI、MSC2中期旋回小;MSC4中期旋回砂體橫向延伸規(guī)模減小,厚度薄,垂向泥質(zhì)夾層和隔層增多,砂體多呈孤立狀分布,在平面上呈南北向細(xì)條帶狀展布。MSC1-MSC3中期旋回的辮狀河三角洲平原砂體橫向上分流河道砂體分布性好,側(cè)向相互疊置的砂體之間常常被細(xì)粒砂巖和泥巖分隔,限制了砂體橫向上的連續(xù)性和連通性,因此單個(gè)河道儲(chǔ)集砂體能夠形成的氣藏各自相對(duì)獨(dú)立,多個(gè)河道儲(chǔ)集砂體的存在能夠形成多個(gè)相對(duì)獨(dú)立的氣藏同時(shí)存在;MSC4中期旋回曲流河三角洲平原砂體由于分流間洼地的大面積分布導(dǎo)致河道相互分割,因此阻礙了砂體之間的連通性,但在不同時(shí)期沉積的多個(gè)分流河道砂體在垂向上不間斷的疊置發(fā)育,仍能形成有利的儲(chǔ)集砂體。(3)儲(chǔ)層宏觀非均質(zhì)性的研究表明整個(gè)盒8段砂巖儲(chǔ)層表現(xiàn)出較強(qiáng)的非均質(zhì)性。MSC1中期旋回砂體連通性最好,分層系數(shù)和砂巖密度高,夾層發(fā)育較少,物性條件中等但均質(zhì)性好,非均質(zhì)性最弱;MSC2中期旋回砂體連通性較好,分層系數(shù)和砂巖密度較高,夾層發(fā)育較少,物性條件及均質(zhì)性中等,非均質(zhì)性較弱;MSC3中期旋回砂體連通性較差,分層系數(shù)和砂巖密度較低,夾層發(fā)育較少,物性條件及均質(zhì)性中等,非均質(zhì)性較強(qiáng);MSC4中期旋回砂體連通性最差,分層系數(shù)低和砂巖密度低,發(fā)育有較多夾層,物性條件中等但均質(zhì)性較差,非均質(zhì)性最強(qiáng)。
[Abstract]:Su-14 well area is an important resource exploration area in Sulige gas field. The main gas producing reservoir is the No. 8 member of Lower Shihezi formation. The reservoir sand body is a large shallow water fluvial delta deposit with a wide distribution of delta sandbodies.However, the transverse distribution of sand bodies is extremely discontinuous, the vertical overlay is superimposed, the gas-bearing sandstone is difficult to identify, the quantitative standard of gas-bearing range is difficult to determine, and the reservoir heterogeneity is strong, which seriously affects the natural gas development effect in this area.On the basis of previous studies, this paper is guided by core observation, geophysical logging data, seismic data and geochemical data, as well as the application of sedimentology, reservoir geology, petroleum geology and other theoretical methods.The sedimentary microfacies and macroscopic heterogeneity characteristics of sand bodies in Bo8 member of Su-14 well area are systematically studied. The size of sand bodies, vertical overlay relations, horizontal distribution characteristics and spatial variation of reservoirs are described by fine description of sand body size, vertical overlay relationship, horizontal distribution characteristics and reservoir spatial variation.The study contents of color, structure, structure, paleontology and geochemical paleosalinity of rocks have been obtained as follows. It is inferred that member 8 is a shallow river sedimentary environment of seasonal arid transitional facies from land to sea and land to land.According to the profile structure, logging facies and seismic facies, it is considered that the delta plain deposits of braided rivers are developed in the middle MSC1-MSC3 cycle, and the sedimentary microfacies are delta plain deposits of the meandering rivers developed in the middle cycle of MSC4, the distributary channel and the interdistributary depressions.The sedimentary microfacies are natural embankment, crevasse fan, distributary channel, interdistributary depressions. MSCI / MSC2 middle cycle sand body is superimposed by braided distributary channel in many periods, and its thickness is large.On the plane, the sand body is distributed in a large area near the north and south direction. The extension scale of the cyclic sand body in the middle period of MSC3 is smaller and the thickness is thinner. The width of the sand body in the plane is smaller than that in the middle cycle of MSC2. The transverse extension scale of the sand body in the middle cycle of MSC4 is smaller than that in the middle cycle of MSC4, and the thickness of the sand body is thin.The vertical muddy intercalation and interlayer increase, the sand bodies are mostly distributed in isolated shape, and the distributary channel sand bodies are distributed in the horizontal direction of the braided river delta plain sand bodies in the middle cycle of MSC1-MSC3.The lateral superimposed sand bodies are often separated by fine-grained sandstone and mudstone, which limits the continuity and connectivity of the sand bodies laterally, so the gas reservoirs that can be formed by a single channel reservoir are relatively independent.The existence of multiple channel reservoir sand bodies can form several relatively independent gas reservoirs and there is also a middle MSC4 cycle meandering river delta plain sand bodies due to a large area distribution of distributary depressions leading to the division of river channels.Therefore, the connectivity between sand bodies is hindered, but many distributary channel sandbodies deposited in different periods are superimposed vertically and continuously.The study of macroscopic heterogeneity of reservoir can still form favorable reservoir sand body. 3) the study shows that the sandstone reservoir of the whole box 8 member shows strong heterogeneity. MSC1 middle cycle sand body connectivity is the best, the stratification coefficient and sandstone density are high, and the intercalation is less developed.The physical property condition is medium but the homogeneity is good, the heterogeneity is weakest, the connectivity of cyclic sand body is better, the stratification coefficient and sandstone density are higher, the intercalation development is less, the physical property condition and homogeneity is medium,In the middle period of MSC3, the connectivity of sand bodies is poor, the stratification coefficient and sandstone density are lower, the intercalation is less, the physical properties and homogeneity are moderate, and the connectivity of the sand bodies in the middle cycle of MSC4 is the worst.The stratification coefficient is low, the sandstone density is low, there are more interlayers, the physical property condition is medium but the homogeneity is poor, and the heterogeneity is the strongest.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.13

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本文編號(hào)：1771650