本文關(guān)鍵詞： 古巖溶地貌 儲(chǔ)層特征 馬家溝組 桃2井區(qū)　出處：《西安石油大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：桃2井區(qū)位于鄂爾多斯盆地蘇里格氣田東南部,區(qū)域構(gòu)造上屬于陜北斜坡西北部,工區(qū)面積約700km~2，，近年來(lái),該區(qū)下古生界有了一定的突破,但對(duì)馬家溝組巖溶儲(chǔ)層的認(rèn)識(shí)還遠(yuǎn)不能滿(mǎn)足目前勘探開(kāi)發(fā)的實(shí)際需要。論文綜合分析錄井、測(cè)井、巖心、巖屑、薄片、試氣以及部分生產(chǎn)資料,結(jié)合前人研宄成果,對(duì)研宄區(qū)奧陶系馬家溝組馬五r馬五4亞段古巖溶儲(chǔ)層的沉積微相、成巖作用類(lèi)型、儲(chǔ)集空間、物性特征及孔隙結(jié)構(gòu)等做了較為系統(tǒng)的研究,主要根據(jù)“桃2井區(qū)石炭系地層厚度圖”、“桃2井區(qū)馬五/底至奧陶系頂厚度圖”以及“桃2井E前石炭系古地質(zhì)圖”,利用定性判識(shí)與定量指標(biāo)相結(jié)合的方法恢復(fù)了研宄區(qū)奧陶系古巖溶地貌,并以此為基礎(chǔ)進(jìn)行巖溶儲(chǔ)層的綜合評(píng)價(jià)。研究結(jié)果表明:研究區(qū)奧陶系馬家溝組馬五「馬五4亞段儲(chǔ)層為典型的碳酸鹽巖夾薄層膏巖巖溶儲(chǔ)層,巖石類(lèi)型以泥-微晶白云巖、微粉晶白云巖及粉晶云巖分布較為廣泛,局部可見(jiàn)較厚層泥晶灰?guī)r;巖溶儲(chǔ)層經(jīng)歷了白云石化作用、壓實(shí)、壓溶作用、巖溶作用、膠結(jié)作用等成巖作用,其中以毛細(xì)管濃縮白云石化和回流滲透白云石化為主的白云石化作用以及同生期、表生期和埋藏期三期巖溶作用的疊加作用是優(yōu)質(zhì)儲(chǔ)層形成的關(guān)鍵;儲(chǔ)層物性以特低孔、低滲為特征,儲(chǔ)集空間中以晶間溶孔、膏�？�、溶洞或溶孔充填殘余孔、非選擇性溶孔、構(gòu)造縫和溶縫為有效的儲(chǔ)滲空間類(lèi)型;儲(chǔ)層溶洞主要以半充填-全充填型為主,充填物主要為方解石,大量充填孔洞的方解石是導(dǎo)致儲(chǔ)層物性變差的重要原因;儲(chǔ)層裂縫以水平縫為主,垂直縫次之,斜交縫較為少見(jiàn),裂縫在粉晶云巖和含泥云巖中相對(duì)較發(fā)育,多為半充填-全充填縫,充填物以方解石和石英為主,這是影響裂縫改善儲(chǔ)層物性和促進(jìn)天然氣運(yùn)移的重要因素;根據(jù)孔隙結(jié)構(gòu)參數(shù)和毛管壓力曲線特征,將孔隙結(jié)構(gòu)劃分為四類(lèi);儲(chǔ)層類(lèi)型主要為裂縫一孔洞型、裂縫一孔隙型;綜合孔隙度、滲透率、測(cè)井含氣飽和度、壓汞曲線類(lèi)型和無(wú)阻流量等指標(biāo),將研究區(qū)奧陶系馬家溝組馬五i-馬五4亞段儲(chǔ)層劃分為4類(lèi),發(fā)現(xiàn)研究區(qū)主要分布III+IV類(lèi)儲(chǔ)層,II類(lèi)儲(chǔ)層呈孤島狀分布在研究區(qū)的部分地區(qū),而I類(lèi)儲(chǔ)層零星分布于研究區(qū)中;同時(shí)結(jié)合白云石化分布趨勢(shì)區(qū)平面圖及奧陶系巖溶古地貌圖,認(rèn)為II類(lèi)儲(chǔ)層主要分布于白云石化作用較強(qiáng)烈的地E 且二者與中級(jí)規(guī)模的殘丘具有良好的對(duì)應(yīng)關(guān)系。
[Abstract]:The Tao-2 well area is located in the southeast of Sulige gas field in Ordos Basin. The regional structure belongs to the northwestern part of northern Shaanxi slope, and the area of the area is about 700km2. In recent years, there has been a certain breakthrough in the Lower Paleozoic in this area. However, the understanding of the karst reservoir in Majiagou formation is far from satisfying the actual needs of exploration and development at present. This paper synthetically analyzes mud logging, logging, core, cuttings, thin slices, gas test and some production materials, and combines the results of previous studies. The sedimentary microfacies, diagenesis type, reservoir space, physical properties and pore structure of paleokarst reservoir of Mawulma No. 4 member of Majiagou formation of Ordovician in the study area are systematically studied. Based on "Carboniferous formation thickness map", "Mawu / Dei-Ordovician top thickness map" and "Preco Carboniferous paleogeology map" in Tao-2 well area, the method of combining qualitative identification with quantitative index is used to recover. The paleokarst geomorphology of Ordovician in the study area, On the basis of this, the comprehensive evaluation of karst reservoir is carried out. The results show that the reservoir of Mawu "Mawu 4 member of Majiagou formation of Ordovician system in the study area is typical carbonate rock thin layer gypsum rock karst reservoir, and the rock type is mud-microcrystalline dolomite." Microcrystalline dolomite and powdery dolomite are widely distributed, and thicker mudstone limestone can be seen locally. The karst reservoir has undergone diagenesis, such as dolomitization, compaction, pressure-dissolution, karstification, cementation and other diagenetic processes, such as dolomitization, compaction, pressure dissolution, karstification, cementation, etc. Among them, the dolomitization with capillary concentration and reflux permeating dolomitization as well as the superposition of karst in syngenic, epigenetic and burial stages are the key to the formation of high quality reservoirs, and the physical properties of reservoirs are very low porosity. The reservoir space is characterized by intergranular dissolving pore, gypsum mold pore, cavern or dissolving hole filling residual pore, non-selective dissolved pore, structural fracture and dissolved fracture as effective type of storage and permeability space, while the reservoir caverns are mainly semi-filled and fully filled. The filling material is mainly calcite, and a large number of calcite filled with holes is the important reason for the poor physical properties of reservoir, the fracture of reservoir is mainly horizontal fracture, the vertical fracture is the second, and the oblique fracture is rare. The fractures are relatively developed in powdery dolomite and mud-bearing dolomite, most of them are half-filled and fully filled fractures, and the main filling materials are calcite and quartz, which are the important factors that affect the improvement of reservoir physical properties and promote the migration of natural gas. According to the parameters of pore structure and the characteristics of capillary pressure curve, the pore structure is divided into four categories: the reservoir type is mainly fracture-hole type, fracture-pore type, comprehensive porosity, permeability, logging gas saturation, The reservoir of Mawui-Mawu 4 submember of Majiagou formation of Ordovician in the study area is divided into 4 types, such as mercury injection curve type and unobstructed flow rate. It is found that the III IV type reservoir and type II reservoir are mainly distributed in the study area as isolated islands in some areas of the study area. The type I reservoir distributes sporadically in the study area, at the same time, combined with the dolomitization distribution trend area plane map and the Ordovician karst paleogeomorphology map, It is considered that the type II reservoir is mainly distributed in the area where dolomitization is relatively strong and that the two reservoirs have a good correspondence with the middle scale residual hills.
【學(xué)位授予單位】：西安石油大學(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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