三塘湖盆地马朗凹陷石炭系地质结构与火山岩分布
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摘要
石炭系是三塘湖盆地丰富的含油气层系,火山岩是有利的油气储集体,但由于在深层难以得到有效的地震反射信息,长期以来对石炭系的内幕结构及火山岩分布认识不清,制约了油气勘探进程。高精度重磁和建场测深综合物探技术的应用,基本搞清了马朗凹陷石炭系残留洼槽的分布、层系结构及其火山岩的纵、横向分布特征,弥补了地震勘探的不足。研究指出,围绕东南部石炭系残留洼槽是有利的油气勘探方向,上石炭统哈尔加乌组低阻层是泥质碎屑岩发育的烃源层,卡拉岗组和巴塔玛依内山组高阻层是火山岩发育的有利储集层。建场测深剖面纵向上能够识别石炭系多套层系及其中分布的火山岩体,高精度重磁则从平面上研究火山岩等地质体的分布特征,二者结合是研究石炭系地质结构与火山岩的有效手段。
The Carboniferous is a new petroliferous system in Santanghu basin, in which volcanic rocks are favorable oil-gas reservoirs. However, the long-term unclear recognition of internal structure of the Carboniferous and distribution of volcanic rocks in it influences the cause for petroleum exploration here, because it is hard to get effective seismic reflectance information from the deep sequences. The application of high-accuracy gravity-magnetic-depth sounding technology allows the previous seismic prospecting deficiency to be made up for, by the fact that the remained trough distribution and the sequence structures as well as the vertical and lateral distribution of volcanic rocks of the Carboniferous in Malang sag are basically recognized. The study shows that the remained trough of Carboniferous in southeastern Malang sag is a favorable target or direction for petroleum exploration. The Harjiawu formation of Upper Carboniferous belonging to low-resistivity bed with argillaceous clastic rock could be as a source rock, while the Kalagang formation and the Batamayineishan formation belonging to high-resistivity bed with volcanic rocks could be favorable reservoirs. The field-constructive sounding profile can be applied to vertically recognize the multi-set sequences and their volcanic bodies; the high-accuracy gravity and magnetic prospecting technology can be used for studying the lateral distribution of geologic bodies like volcanic rocks. It is suggested that the integration of these two technologies should be effective means for study of the geologic structure and volcanic rocks of the Carboniferous in this area.
The Carboniferous is a new petroliferous system in Santanghu basin, in which volcanic rocks are favorable oil-gas reservoirs. However, the long-term unclear recognition of internal structure of the Carboniferous and distribution of volcanic rocks in it influences the cause for petroleum exploration here, because it is hard to get effective seismic reflectance information from the deep sequences. The application of high-accuracy gravity-magnetic-depth sounding technology allows the previous seismic prospecting deficiency to be made up for, by the fact that the remained trough distribution and the sequence structures as well as the vertical and lateral distribution of volcanic rocks of the Carboniferous in Malang sag are basically recognized. The study shows that the remained trough of Carboniferous in southeastern Malang sag is a favorable target or direction for petroleum exploration. The Harjiawu formation of Upper Carboniferous belonging to low-resistivity bed with argillaceous clastic rock could be as a source rock, while the Kalagang formation and the Batamayineishan formation belonging to high-resistivity bed with volcanic rocks could be favorable reservoirs. The field-constructive sounding profile can be applied to vertically recognize the multi-set sequences and their volcanic bodies; the high-accuracy gravity and magnetic prospecting technology can be used for studying the lateral distribution of geologic bodies like volcanic rocks. It is suggested that the integration of these two technologies should be effective means for study of the geologic structure and volcanic rocks of the Carboniferous in this area.
引文
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[2]李溪滨.三塘湖盆地石油地质特征与勘探建议[J].新疆石油质地,1994,15(2):110-115.
[3]胡望水,张或舟.新疆三塘湖盆地构造演化与含油气系统[J].西南石油学院学报,1997,19(2):15-17.
[4]张恺.新疆三塘湖盆地板块构造演化特征及其含油气远景评价[J].新疆石油地质,1993,14(1):3-12.
[5]何展翔.综合物化探技术新进展及应用[J].石油地球物理勘探,2005,40(1):108-113.
[6]刘洪福,尹风娟.新疆三塘湖盆地卡拉岗组时代问题商榷[J].西北大学学报,2001,31(6):496-499.
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