双城断陷地质结构与主控断裂形成机制
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摘要
松辽盆地北部深层双城断陷主控断裂构造形迹复杂,其形成机制和期次一直是争论较大的问题。根据断陷类型分类的依据,对双城断陷主控断裂的构造几何学特征及区域构造应力场进行了分析,指出双城断陷NNE向、NW向和NEE向断裂是在同一构造应力场条件下形成的具有不同性质的主控断裂,NW向(NWW向)和NEE向(NE向)构造为张扭性断裂,控制着双城断陷构造深凹区的形成和发育规模。研究成果为深层天然气富集区域的研究提供了重要的地质依据。通过二维、三维地震连片解释,落实了断陷结构和构造格局,结论认为:莺山凹陷为构造深凹区,规模较大,受张扭性断裂控制,是继徐家围子之后深层天然气勘探的主力接替区。
Disagreement always exists concerning the formation mechanism and the timing of the major faults with complex structural features in the deep Shuangcheng fault depression in northern Songliao Basin.Analysis of the geometrical features and regional tectonic stress field of the major faults,in combination with the criteria for classification of fault depression,reveal that the NNE-,NW-,and NEE-trending faults are the major faults of various natures formed in the same tectonic stress field.The NW(NWW)and NEE(NE)trending faults are transtensional in nature and control the formation and scale of the deep sag in the Shuangcheng fault depression,providing important bases for research of deep gas accumulation.The geological structure and structural framework of the depression are identified through 2D and 3D seismic interpretation.It is believed that the Yingshan sag,a kind of large-scale deep sag under the control of transtensional faults,is another target for deep gas exploration following the Xujiaweizi depression.
Disagreement always exists concerning the formation mechanism and the timing of the major faults with complex structural features in the deep Shuangcheng fault depression in northern Songliao Basin.Analysis of the geometrical features and regional tectonic stress field of the major faults,in combination with the criteria for classification of fault depression,reveal that the NNE-,NW-,and NEE-trending faults are the major faults of various natures formed in the same tectonic stress field.The NW(NWW)and NEE(NE)trending faults are transtensional in nature and control the formation and scale of the deep sag in the Shuangcheng fault depression,providing important bases for research of deep gas accumulation.The geological structure and structural framework of the depression are identified through 2D and 3D seismic interpretation.It is believed that the Yingshan sag,a kind of large-scale deep sag under the control of transtensional faults,is another target for deep gas exploration following the Xujiaweizi depression.
引文
[1]冯志强.松辽盆地庆深大气田的勘探前景[J].天然气工业,2006,26(6):1-5.
[2]王贵文,惠山,付广.徐家围子断陷天然气分布规律及其主控因素[J].大庆石油地质与开发,2008,27(1):6-9.
[3]刘启,舒萍,李松光.松辽盆地北部深层火山岩气藏综合描述技术[J].大庆石油地质与开发,2005,24(3):21-23.
[4]吴河勇,冯子辉,杨永斌,等.松辽盆地北部深层天然气勘探风险评价[J].天然气工业,2006,26(6):6-9.
[5]GAWTHORPE R L,LEEDER M R.Tectono-sedimen-tary evolution of active extensional basins[J].Basin Re-search,2000(3/4):195-218.
[2]王贵文,惠山,付广.徐家围子断陷天然气分布规律及其主控因素[J].大庆石油地质与开发,2008,27(1):6-9.
[3]刘启,舒萍,李松光.松辽盆地北部深层火山岩气藏综合描述技术[J].大庆石油地质与开发,2005,24(3):21-23.
[4]吴河勇,冯子辉,杨永斌,等.松辽盆地北部深层天然气勘探风险评价[J].天然气工业,2006,26(6):6-9.
[5]GAWTHORPE R L,LEEDER M R.Tectono-sedimen-tary evolution of active extensional basins[J].Basin Re-search,2000(3/4):195-218.
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