川中广安地区须家河组须二段气藏储层预测
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摘要
在对四川盆地中部广安地区上三叠统须家河组的钻探过程中频繁出现油气显示,展示了较大的油气勘探潜力,因此,对该区须家河组须二段开展储层预测及油气检测研究十分必要。为此,对过该区的剖面总长度达890km的29条二维地震测线进行了分析,利用多井进行合成记录标定,开展了以须家河组为主要目的层的精细解释。在分析须二段储层地质、地球物理特征的基础上,根据已知钻遇出气层段并结合最新地质、钻井、测井等资料,对须二段气藏进行了储层预测,获得了储层厚度、孔隙度、储能系数等参数,同时圈定须二段有利含油气区的分布范围。结论认为:①须二段储层相对发育区主要分布在庙4井—合川151井,厚度大于10m的分布面积为173.4km2;②须二段油气检测有利区总体上呈现北西向或东西向分布,有利区面积共516.2km2,主要分布在合川—白庙地区,呈条带分布。在此基础上,指明了下一步天然气勘探的有利区。
Great prospect has been demonstrated by frequent hydrocarbon shows in the exploratory drilling in the Upper Triassic Xujiahe Formation of the Guang'an area,middle Sichuan Basin.So reservoir prediction and hydrocarbon detection are necessary in this study area.Thus,through the analysis of 29 2D seismic lines with the total length of 890 km in the profile of this area and in combination with the integrated logging data of multiple wells,the fine interpretation is made with the Xujiahe Formation taken as the pay zones.Then,geological and geophysical characteristics of the 2nd member of the Xujiahe Formation is analyzed;on this basis,according to the latest geologic,drilling and logging data from the gas pay zone,the reservoir prediction is performed in this study area,from which such parameters as thickness,porosity,storage factor,etc.are obtained and the distribution range of hydrocarbon favorable areas is also delineated.The following conclusions are drawn.(1) The relatively well-developed zones are mainly distributed in the area between Miao-4 well and Hechuan-151 well,and the reservoirs with thickness of more than 10 m have an area of 173.4 km2.(2) In general,favorable areas for hydrocarbon detection in this study area are distributed in the NW or EW direction with an area of 516.2 km2;they are mainly distributed in strips or belts in the area between Hechuan and Baimiao.On this basis,the further favorable zones for natural gas exploration are pointed out herein in this paper.
Great prospect has been demonstrated by frequent hydrocarbon shows in the exploratory drilling in the Upper Triassic Xujiahe Formation of the Guang'an area,middle Sichuan Basin.So reservoir prediction and hydrocarbon detection are necessary in this study area.Thus,through the analysis of 29 2D seismic lines with the total length of 890 km in the profile of this area and in combination with the integrated logging data of multiple wells,the fine interpretation is made with the Xujiahe Formation taken as the pay zones.Then,geological and geophysical characteristics of the 2nd member of the Xujiahe Formation is analyzed;on this basis,according to the latest geologic,drilling and logging data from the gas pay zone,the reservoir prediction is performed in this study area,from which such parameters as thickness,porosity,storage factor,etc.are obtained and the distribution range of hydrocarbon favorable areas is also delineated.The following conclusions are drawn.(1) The relatively well-developed zones are mainly distributed in the area between Miao-4 well and Hechuan-151 well,and the reservoirs with thickness of more than 10 m have an area of 173.4 km2.(2) In general,favorable areas for hydrocarbon detection in this study area are distributed in the NW or EW direction with an area of 516.2 km2;they are mainly distributed in strips or belts in the area between Hechuan and Baimiao.On this basis,the further favorable zones for natural gas exploration are pointed out herein in this paper.
引文
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