鄂尔多斯盆地东部马家沟组中组合天然气资源潜力评价
发布时间：2018-11-04 18:40
【摘要】：本论文以鄂尔多斯盆地东部马家沟组中组合(马五_5-马五_(10))为研究对象,在前人研究的基础上,综合利用野外露头、岩芯观察、钻井、测井等资料,结合有机地球化学、沉积学等学科的原理及方法,对研究区马家沟组中组合天然气源岩的有机地化特征、展布特征及生烃能力特征进行了研究,并利用地质类比-概率法对该区天然气资源潜力进行评价:研究区烃源岩在纵向上主要分布于石炭系上统本溪组-二叠系下统山西组的煤岩及煤系泥岩、奥陶系马家沟组的马三段与马五段的碳酸盐岩。盆地东部上古生界煤系烃源岩有机质丰度较高,有机质类型为Ⅲ型,主要处于高-过成熟阶段。马家沟组碳酸盐岩烃源岩主要为灰岩及灰质云岩,有机碳含量较低,大部分处于0.2%~0.4%之间,有机质类型以Ⅰ型为主,Ⅱ1型、Ⅱ2型为辅,有机质热演化程度总体处于高-过成熟阶段。研究区上古生界暗色泥岩烃源岩厚度一般为60~100m,煤层厚度为10~25m。奥陶系马家沟组烃源岩主要为碳酸盐岩,厚度约为50~100m,纵向上主要分布马五段和马三段。根据研究区马家沟组碳酸盐岩烃源岩的生排烃特征、有机碳含量及碳酸盐岩储层特征,鄂尔多斯盆地碳酸盐岩烃源岩有机碳含量下限值取0.25%较为合适。研究区上古生界烃源岩平面上分布广泛,生气强度较高,达到20.0~30.0×10~8m~3/km2,生烃能力较强。马家沟组烃源岩生烃强度一般为2.5~10×10~8m~3/km2左右,烃源岩生烃能力总体上为低等偏差。采用地质类比-概率法对鄂尔多斯盆地东部进行了天然气资源潜力评价。鄂尔多斯盆地东部“半环形”天然气聚集带中组合地质资源量为6400~18700×10~8m~3。进一步预测出三个有利勘探区:北部乌审旗东马五5区块、中部横山-安塞马五7区块和靖边马五9区块。三个战略目标资源量一共为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，
本文编号：2310804
[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，
本文编号：2310804
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