本文選題：鄂爾多斯盆地　切入點：奧陶紀　出處：《天然氣工業(yè)》2017年01期

【摘要】：白云巖是鄂爾多斯盆地奧陶系最重要的有效儲集巖類,由于巖石結(jié)構(gòu)及產(chǎn)狀特征復雜多變,對其成因認識尚存在爭議。為此,綜合宏觀區(qū)域地質(zhì)背景、微觀巖石結(jié)構(gòu)、礦物學及巖石地球化學等分析研究成果,將該區(qū)奧陶系白云巖劃分為泥—細粉晶、粗粉晶、細(中)晶3種類型,指出其分別形成于"蒸發(fā)泵吸準同生云化""淡水與富鎂鹵水混合水云化""回流—滲透云化"3種不同的白云巖化成巖作用環(huán)境,并在層位及空間展布上表現(xiàn)出明顯的"層控性"及"區(qū)位性"分布特征。進而探討了白云巖的成因,結(jié)果認為:① 3種白云巖化作用在時空演化特征上表現(xiàn)出一定的相關(guān)性,即均與蒸發(fā)背景下的膏鹽礦物沉淀有著密切的成因聯(lián)系;②白云巖中所發(fā)育的溶孔、白云石晶間孔及生物格架孔等主要孔隙類型分別形成于3種白云巖類型中,對白云巖類型表現(xiàn)出一定的"專屬性",表明孔隙成因與白云巖化成巖作用環(huán)境密切相關(guān);③白云巖有效儲層的發(fā)育與分布主要受原始沉積相帶、大區(qū)白云巖化的成巖作用環(huán)境、相對海平面變化產(chǎn)生的層序界面等3類要素的控制。
[Abstract]:Dolomite is the most important effective reservoir rock of Ordovician in Ordos Basin. Because of the complex and changeable characteristics of rock structure and occurrence, there is still controversy on its origin. According to the results of mineralogical and petrogeochemical analysis, dolomite of Ordovician system in this area is divided into three types: mud-fine silt, coarse silt, fine (middle) grain, etc. It is pointed out that they are formed in three different dolomite diagenesis environments: evaporative pump suction syngenic cloud formation, mixed water clouding of fresh water and massium-rich brine, and "refluxing and permeating cloud formation". The distribution characteristics of "stratification" and "location" are obvious on the horizon and spatial distribution. Furthermore, the origin of dolomite is discussed, and the results show that there is a certain correlation in the evolution characteristics of space-time evolution of the dolomitization of 1: 13 kinds of dolomitization. That is to say, both of them are closely related to the deposit of gypsum minerals in evaporative background. The main pore types, such as dolomite intergranular pore and bioglass pore, are formed in three dolomite types, respectively. It shows that pore genesis is closely related to dolomite diagenesis environment. The development and distribution of effective reservoir of dolomite are mainly affected by the original sedimentary facies zone and diagenetic environment of dolomitization in large area. The control of three kinds of elements such as sequence interface produced by relative sea level change.
【作者單位】： 中國石油長慶油田公司;低滲透油氣田勘探開發(fā)國家工程實驗室;
【基金】：“十三五”國家科技重大專項“大型油氣田及煤層氣開發(fā)”(編號:2016ZX05004-006)
【分類號】：P618.13;P588.245

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