剥蚀厚度恢复法在渤海湾盆地济阳坳陷孔店组应用
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摘要
针对勘探程度较低的复杂断陷盆地,利用常规剥蚀厚度恢复方法无法准确恢复其剥蚀厚度的问题,提出了1种基于构造演化研究的剥蚀厚度恢复方法,即从剥蚀动力学角度出发,分析剥蚀的成因机制,利用构造演化研究的平衡剖面,用地震资料界定剥蚀范围和求取剥蚀厚度,再根据已确定剥蚀区域的实际钻井资料情况,采用沉积速率法、波动分析法等进行井震结合的剥蚀厚度恢复。并以渤海湾盆地济阳坳陷孔店组为例,对孔一段(Ek1)和孔二段(Ek2)剥蚀厚度进行了恢复,结果表明:孔一段(Ek1)受剥蚀作用较强,在区域上存在较大差异,总体上剥蚀厚度较大,而孔二段(Ek2)受剥蚀作用较弱,剥蚀厚度较薄。该方法比传统的单一方法更加精确可靠,对恢复复杂断陷盆地剥蚀厚度具有较好的效果。
It's difficlut to recover the erosion thickness precisely by common methods for the complex fault basin,which has a low degree of prospecting.So a new way based on structure evolution for recovering erosion thickness has been proposed.According to the dynamic of erosion,it can analyse contributing factors of erosion,divide areas of erosion and calculate the worth of erosion thickness by using structure evolution sections and the seismic data.Based on the integration of well and seismic in main erosion area,the erosion amounts of local layers were calculated by means of the sedimentary rate,wave analysis.Taking Kongdian formation of Jiyang depression in Bohai bay basin as an example,Ek1 and Ek2's erosion thickness were recovered.The result showed that Ek1 was denuded more seriously and the one area differs from another greatly.But a whole,the erosion thickness of Ek1 was thicker than Ek2.Eventually,this method was more accurate than others,which could be used to recover the erosion thickness of the complex fault basin precisely.
It's difficlut to recover the erosion thickness precisely by common methods for the complex fault basin,which has a low degree of prospecting.So a new way based on structure evolution for recovering erosion thickness has been proposed.According to the dynamic of erosion,it can analyse contributing factors of erosion,divide areas of erosion and calculate the worth of erosion thickness by using structure evolution sections and the seismic data.Based on the integration of well and seismic in main erosion area,the erosion amounts of local layers were calculated by means of the sedimentary rate,wave analysis.Taking Kongdian formation of Jiyang depression in Bohai bay basin as an example,Ek1 and Ek2's erosion thickness were recovered.The result showed that Ek1 was denuded more seriously and the one area differs from another greatly.But a whole,the erosion thickness of Ek1 was thicker than Ek2.Eventually,this method was more accurate than others,which could be used to recover the erosion thickness of the complex fault basin precisely.
引文
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[2]宗国洪,肖焕钦,李常宝,等.济阳坳陷构造演化及其大地构造意义[J].高校地质学报,1999,5(3):275-282.
[3]郭兴伟,施小斌,丘学林,等.济阳坳陷新生代构造沉降特征[J].中国石油大学学报,2006,30(3):6-11.
[4]庞雄奇.地质过程定量模拟[M].北京:石油工业出版社,2003:120-138.
[5]姜素华,许新明,康恒茂,等.波动分析约束下的原型盆地剥蚀量恢复—以惠民凹陷为例[J].中国海洋大学学报:自然科学版,2007,37(4):641-646.
[6]韩用兵,王良书,刘绍文.渤海湾盆地济阳坳陷沙四段和孔店组地层剥蚀厚度恢复[J].高校地质学报,2004,10(3):440-448.
[7]Katz B J,Pheifer R N,Schunk D J.Interpretation of discontinuousvitrinite reflectance profiles[J].AAPG,1988,72(8):926-931.
[8]Carter A,Roques D,Bristow C S.Denudation History of OnshoreCentral Vietnam:Constraints on the Cenozoic Evolution of theWestern Margin of the South China Sea[J].Tectonophysics,2000,322(3-4):265-277.
[9]贾霍甫,梅廉夫,施和生,等.断陷盆地剥蚀厚度恢复的构造沉积综合法[J].石油物探,2009,48(3):314-319.
[10]夏斌,黄先雄,蔡周荣,等.济阳坳陷印支—燕山期构造运动特征与油气藏的关系[J].天然气地球科学,2007,18(6):832-837.
[11]韩立国.济阳坳陷构造体制转换与郯庐断裂带的关系探讨[J].岩性油气藏,2009,21(1):72-74.
[12]杨品荣,陈洁,蔡进功,等.济阳坳陷构造转型期及其石油地质意义[J].油气地质与采收率,2001,8(3):5-7.
[13]林会喜,吴智平.华北东部盆地叠合单元划分及其石油地质意义[J].高校地质学报,2010,16(1):53-62.
[14]纪友亮,胡光明,黄建军,等.渤海湾地区中生代地层剥蚀量及中、新生代构造演化研究[J].地质学报,2006,80(3):351-358.
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