利用人工场源电磁法-建场测深确定深层石炭系沉积结构特征——以三塘湖马36井油气发现为例
|
摘要
中国西部三塘湖盆地深层石炭系属海相沉积,埋深大,火山岩发育,物探技术对复杂石炭系内幕结构认识不清,制约了勘探进程。石炭系火成岩电阻率明显高于砂泥岩,具备通过电性变化进行识别的条件。人工场源电磁法-建场测深通过改进仪器、野外采集技术,采用与地震联合的二维约束反演技术,提高了探测深度和深层分辨率,清楚地揭示上石炭统上、下火山岩为主的二套层系间存在一套哈尔加乌组低阻碎屑岩层,并圈划出分布范围。此范围确定的马20井钻探结果证实,哈尔加乌组是以碎屑岩为主的烃源层。在马36井获得高产,针对石炭系内幕低阻层系烃源岩勘探取得突破。
In STH basin of western China develops Carboniferous formations with marine facies in deep underground and in the formations exists volcanic rock widely.Traditional prospecting ways give no definite description about the inner structures and resource rock which is mainly composed of clastic rock.Available data in the area shows that Carboniferous igneous rock shows apparently higher resistivity than sandslime,so it is possible to detect igneous mass by making use of the resistivity contrast.In recent years,controlled source techniques are greatly improved on acquisition meters and methods.2D inversion of controlled source EM data with seismic data as constraint increases sounding depth and improves resolution of deep structure interpretation.With the progress,igneous mass in STH basin is described more detailedly.The project reveals that between the upper volcanics and the lower one exists a low-resistivity clastic formation C2h within the upper Carboniferous system.The formation is finally delineated.Well M20 is drilled subsequently,and the drilling result discovers that the C2h formation is a set of carbonaceous mudstone and grey basalt,which is hydrocarbon source rock with the major content of clastic rock.Following well M20,another well M36 is designed based on the interpretation of the project and drilled.This well produces commercial petroleum.This project made progress in the prospecting of low resistivity source rock within Carboniferous formation.
In STH basin of western China develops Carboniferous formations with marine facies in deep underground and in the formations exists volcanic rock widely.Traditional prospecting ways give no definite description about the inner structures and resource rock which is mainly composed of clastic rock.Available data in the area shows that Carboniferous igneous rock shows apparently higher resistivity than sandslime,so it is possible to detect igneous mass by making use of the resistivity contrast.In recent years,controlled source techniques are greatly improved on acquisition meters and methods.2D inversion of controlled source EM data with seismic data as constraint increases sounding depth and improves resolution of deep structure interpretation.With the progress,igneous mass in STH basin is described more detailedly.The project reveals that between the upper volcanics and the lower one exists a low-resistivity clastic formation C2h within the upper Carboniferous system.The formation is finally delineated.Well M20 is drilled subsequently,and the drilling result discovers that the C2h formation is a set of carbonaceous mudstone and grey basalt,which is hydrocarbon source rock with the major content of clastic rock.Following well M20,another well M36 is designed based on the interpretation of the project and drilled.This well produces commercial petroleum.This project made progress in the prospecting of low resistivity source rock within Carboniferous formation.
引文
[1]孙自明,雄保贤,李永林,等,三塘湖盆地构造特征与有利勘探方向[J].石油试验地质,2001,23(3):24-26.
[2]王晓萍,高红霞.固定场源仪器原理[J].石油仪器,2001,12(2):32-34.
[3]王庆乙.近区瞬变场频率效应与大深度勘探能力研究[J].地质与勘探,2007,43(1):78-83.
[4]杨谦,李正文.多参数约束反演系统原理与方法[J].成都理工学院学报,1996,23(2):93-100.
[2]王晓萍,高红霞.固定场源仪器原理[J].石油仪器,2001,12(2):32-34.
[3]王庆乙.近区瞬变场频率效应与大深度勘探能力研究[J].地质与勘探,2007,43(1):78-83.
[4]杨谦,李正文.多参数约束反演系统原理与方法[J].成都理工学院学报,1996,23(2):93-100.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心