川中充西地区多口钻井在雷三2亚段泥灰岩储层中油气显示好,测井解释储层发育,展示了良好的勘探潜力。为准确预测雷三2亚段泥灰岩储层纵横向分布,为下一步勘探部署提供指导,首先利用储层合成记录标定明确储层地球物理响应特征;接着围绕...川中充西地区多口钻井在雷三2亚段泥灰岩储层中油气显示好,测井解释储层发育,展示了良好的勘探潜力。为准确预测雷三2亚段泥灰岩储层纵横向分布,为下一步勘探部署提供指导,首先利用储层合成记录标定明确储层地球物理响应特征;接着围绕岩性和储层分别开展岩石物理分析,优选盐岩和泥灰岩储层的敏感参数,利用地震波形指示模拟预测盐岩的分布;最后利用波形指示反演预测泥灰岩储层的分布。结果表明:雷三2亚段顶部盐岩对应强波峰反射,储层底界对应弱波峰反射,储层与盐岩存在明显的波阻抗重叠,而盐岩与其他岩性在密度上存在明显差异,当去除盐岩的影响后,利用波阻抗可以较好地区分储层和非储层。因此,在利用波形指示模拟识别盐岩分布后,地震波形指示反演可有效识别储层。充西三维区储层大面积发育,厚30~60 m,发育岩性圈闭16个,总面积124 km 2,是下一步富有机质泥灰岩储层的现实勘探方向。展开更多
In 2022,the risk exploration well Chongtan1(CT1)in the Sichuan Basin revealed commercial oil and gas flow during test in a new zone–the marl of the second submember of the third member of Leikoupo Formation(Lei-32)of...In 2022,the risk exploration well Chongtan1(CT1)in the Sichuan Basin revealed commercial oil and gas flow during test in a new zone–the marl of the second submember of the third member of Leikoupo Formation(Lei-32)of Middle Triassic,recording a significant discovery.However,the hydrocarbon accumulation in marl remains unclear,which restricts the selection and deployment of exploration area.Focusing on Well CT1,the hydrocarbon accumulation characteristics of Lei-32 marl are analyzed to clarify the potential zones for exploration.The following findings are obtained.First,according to the geochemical analysis of petroleum and source rocks,oil and gas in the Lei-32 marl of Well CT1 are originated from the same marl.The marl acts as both source rock and reservoir rock.Second,the Lei-32 marl in central Sichuan Basin is of lagoonal facies,with a thickness of 40–130 m,an area of about 40000 km^(2),a hydrocarbon generation intensity of(4–12)×10^(8) m^(3)/km^(2),and an estimated quantity of generated hydrocarbons of 25×10^(12) m^(3).Third,the lagoonal marl reservoirs are widely distributed in central Sichuan Basin.Typically,in Xichong–Yilong,Ziyang–Jianyang and Moxi South,the reservoirs are 20–60 m thick and cover an area of 7500 km^(2).Fourth,hydrocarbons in the lagoonal marl are generated and stored in the Lei-32 marl,which means that marl serves as both source rock and reservoir rock.They represent a new type of unconventional resource,which is worthy of exploring.Fifth,based on the interpretation of 2D and 3D seismic data from central Sichuan Basin,Xichong and Suining are defined as favorable prospects with estimated resources of(2000–3000)×10^(8) m^(3).展开更多
文摘川中充西地区多口钻井在雷三2亚段泥灰岩储层中油气显示好,测井解释储层发育,展示了良好的勘探潜力。为准确预测雷三2亚段泥灰岩储层纵横向分布,为下一步勘探部署提供指导,首先利用储层合成记录标定明确储层地球物理响应特征;接着围绕岩性和储层分别开展岩石物理分析,优选盐岩和泥灰岩储层的敏感参数,利用地震波形指示模拟预测盐岩的分布;最后利用波形指示反演预测泥灰岩储层的分布。结果表明:雷三2亚段顶部盐岩对应强波峰反射,储层底界对应弱波峰反射,储层与盐岩存在明显的波阻抗重叠,而盐岩与其他岩性在密度上存在明显差异,当去除盐岩的影响后,利用波阻抗可以较好地区分储层和非储层。因此,在利用波形指示模拟识别盐岩分布后,地震波形指示反演可有效识别储层。充西三维区储层大面积发育,厚30~60 m,发育岩性圈闭16个,总面积124 km 2,是下一步富有机质泥灰岩储层的现实勘探方向。
基金Supported by the PetroChina Science and Technology Project(2021DJ0501,2018A-0105).
文摘In 2022,the risk exploration well Chongtan1(CT1)in the Sichuan Basin revealed commercial oil and gas flow during test in a new zone–the marl of the second submember of the third member of Leikoupo Formation(Lei-32)of Middle Triassic,recording a significant discovery.However,the hydrocarbon accumulation in marl remains unclear,which restricts the selection and deployment of exploration area.Focusing on Well CT1,the hydrocarbon accumulation characteristics of Lei-32 marl are analyzed to clarify the potential zones for exploration.The following findings are obtained.First,according to the geochemical analysis of petroleum and source rocks,oil and gas in the Lei-32 marl of Well CT1 are originated from the same marl.The marl acts as both source rock and reservoir rock.Second,the Lei-32 marl in central Sichuan Basin is of lagoonal facies,with a thickness of 40–130 m,an area of about 40000 km^(2),a hydrocarbon generation intensity of(4–12)×10^(8) m^(3)/km^(2),and an estimated quantity of generated hydrocarbons of 25×10^(12) m^(3).Third,the lagoonal marl reservoirs are widely distributed in central Sichuan Basin.Typically,in Xichong–Yilong,Ziyang–Jianyang and Moxi South,the reservoirs are 20–60 m thick and cover an area of 7500 km^(2).Fourth,hydrocarbons in the lagoonal marl are generated and stored in the Lei-32 marl,which means that marl serves as both source rock and reservoir rock.They represent a new type of unconventional resource,which is worthy of exploring.Fifth,based on the interpretation of 2D and 3D seismic data from central Sichuan Basin,Xichong and Suining are defined as favorable prospects with estimated resources of(2000–3000)×10^(8) m^(3).
