發(fā)布時間：2018-11-04 18:40

【摘要】：本論文以鄂爾多斯盆地東部馬家溝組中組合(馬五_5-馬五_(10))為研究對象,在前人研究的基礎(chǔ)上,綜合利用野外露頭、巖芯觀察、鉆井、測井等資料,結(jié)合有機地球化學(xué)、沉積學(xué)等學(xué)科的原理及方法,對研究區(qū)馬家溝組中組合天然氣源巖的有機地化特征、展布特征及生烴能力特征進行了研究,并利用地質(zhì)類比-概率法對該區(qū)天然氣資源潛力進行評價:研究區(qū)烴源巖在縱向上主要分布于石炭系上統(tǒng)本溪組-二疊系下統(tǒng)山西組的煤巖及煤系泥巖、奧陶系馬家溝組的馬三段與馬五段的碳酸鹽巖。盆地東部上古生界煤系烴源巖有機質(zhì)豐度較高,有機質(zhì)類型為Ⅲ型,主要處于高-過成熟階段。馬家溝組碳酸鹽巖烴源巖主要為灰?guī)r及灰質(zhì)云巖,有機碳含量較低,大部分處于0.2%~0.4%之間,有機質(zhì)類型以Ⅰ型為主,Ⅱ1型、Ⅱ2型為輔,有機質(zhì)熱演化程度總體處于高-過成熟階段。研究區(qū)上古生界暗色泥巖烴源巖厚度一般為60~100m,煤層厚度為10~25m。奧陶系馬家溝組烴源巖主要為碳酸鹽巖,厚度約為50~100m,縱向上主要分布馬五段和馬三段。根據(jù)研究區(qū)馬家溝組碳酸鹽巖烴源巖的生排烴特征、有機碳含量及碳酸鹽巖儲層特征,鄂爾多斯盆地碳酸鹽巖烴源巖有機碳含量下限值取0.25%較為合適。研究區(qū)上古生界烴源巖平面上分布廣泛,生氣強度較高,達到20.0~30.0×10~8m~3/km2,生烴能力較強。馬家溝組烴源巖生烴強度一般為2.5~10×10~8m~3/km2左右,烴源巖生烴能力總體上為低等偏差。采用地質(zhì)類比-概率法對鄂爾多斯盆地東部進行了天然氣資源潛力評價。鄂爾多斯盆地東部“半環(huán)形”天然氣聚集帶中組合地質(zhì)資源量為6400~18700×10~8m~3。進一步預(yù)測出三個有利勘探區(qū):北部烏審旗東馬五5區(qū)塊、中部橫山-安塞馬五7區(qū)塊和靖邊馬五9區(qū)塊。三個戰(zhàn)略目標(biāo)資源量一共為5290×10~8m~3。
[Abstract]:This paper takes Majiagou formation in eastern Ordos Basin as the object of study. On the basis of previous studies, the data of outcrop, core observation, drilling, logging and so on are synthetically used, such as field outcrop, core observation, drilling, logging and so on. Combined with the principles and methods of organic geochemistry and sedimentology, the organic geochemical characteristics, distribution characteristics and hydrocarbon generation ability of the natural gas source rocks in the Majiagou formation of the study area are studied. The potential of natural gas resources in the study area is evaluated by means of geological analogy and probability method. The source rocks in the study area are mainly distributed vertically in coal rocks and mudstones of the Upper Carboniferous Benxi formation and Lower Permian Shanxi formation in the study area. Carbonate rocks of the third and fifth member of the Majiagou formation in Ordovician. In the eastern part of the basin, the abundance of organic matter in the Upper Paleozoic coal-measure source rocks is relatively high, and the organic matter type is type 鈪，

本文編號：2310804