發(fā)布時(shí)間：2018-08-19 09:38

【摘要】：以四川盆地及周緣牛蹄塘組和五峰組—龍馬溪組2套頁(yè)巖層為研究對(duì)象,通過(guò)對(duì)不同地區(qū)、不同含氣性和產(chǎn)量的典型頁(yè)巖氣井進(jìn)行解剖,探討了影響頁(yè)巖氣保存條件的主控因素及評(píng)價(jià)體系。研究認(rèn)為:頂?shù)装鍡l件、頁(yè)巖自身封蓋作用是該區(qū)頁(yè)巖氣早期滯留于頁(yè)巖內(nèi)的關(guān)鍵因素,后期構(gòu)造改造強(qiáng)度與所持續(xù)的時(shí)間對(duì)頁(yè)巖氣藏的含氣豐度具有明顯的調(diào)整作用;保存條件對(duì)頁(yè)巖氣層的含氣量、孔隙度、含水飽和度、電阻率以及頁(yè)巖氣氣體組分等有明顯的影響,保存條件差,頁(yè)巖氣層含氣量、孔隙度、電阻率通常較低,含水飽和度、N2含量則較高,這些被影響的參數(shù)可以作為評(píng)價(jià)頁(yè)巖氣保存條件優(yōu)劣的間接指標(biāo)。建立了四川盆地及周緣復(fù)雜構(gòu)造區(qū)下古生界海相頁(yè)巖氣5大類、28項(xiàng)參數(shù)的保存條件綜合評(píng)價(jià)指標(biāo)體系,即主要是封蓋條件、頁(yè)巖氣層自身封堵性、構(gòu)造作用(構(gòu)造改造時(shí)間、斷裂作用、地層變形強(qiáng)度等)等條件在時(shí)間和空間上的組合關(guān)系,另外頁(yè)巖氣層含氣性表征參數(shù)和壓力系數(shù)同樣可在一定程度上指示保存條件的優(yōu)劣。
[Abstract]:Taking two sets of shale formations in Sichuan Basin and its surrounding Niutetang formation and Wufeng formation and Longmaxi formation as research objects, the typical shale gas wells with different gas content and output in different regions were dissected. The main controlling factors and evaluation system of shale gas preservation conditions are discussed. It is concluded that the sealing of shale itself is the key factor for early retention of shale gas in this area under roof and floor conditions, and that the strength and duration of late structural transformation have a significant effect on the gas abundance of shale gas reservoir. The preservation conditions have obvious influence on the gas content, porosity, water saturation, resistivity and gas composition of shale gas reservoir. The gas content, porosity and resistivity of shale gas reservoir are usually low. The N _ 2 content of water saturation is higher, and these affected parameters can be used as an indirect index to evaluate the preservation conditions of shale gas. A comprehensive evaluation index system for the preservation conditions of 28 parameters of 5 major types of Lower Paleozoic marine shale gas in the Sichuan Basin and its surrounding complex tectonic areas is established, namely, the main sealing conditions, the shale gas reservoir plugging property, the tectonic process (the time of structural transformation, etc.) The combination relationship between time and space of the conditions such as fracture and deformation intensity of formation etc. In addition, the parameters of gas bearing characterization and pressure coefficient of shale gas reservoir can also indicate the advantages and disadvantages of the preservation conditions to a certain extent.
【作者單位】： 中國(guó)石化勘探分公司;
【基金】：中國(guó)石化科技部基礎(chǔ)研究項(xiàng)目(P15074) 中國(guó)地質(zhì)調(diào)查局地質(zhì)調(diào)查項(xiàng)目(12120115003901)資助
【分類號(hào)】：P618.13

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本文編號(hào)：2191274