松辽盆地徐家围子断陷边界断裂生长过程的定量分析
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摘要
徐家围子断陷位于松辽盆地中部,受徐西和宋西两条边界断裂控制。基于地震反射剖面地质解译成果,应用断层沿走向位移-长度曲线形态分析方法和沿倾向生长速率分析方法,对两条断裂的生长演化过程进行了初步的研究。结果表明,沙河子期(136~144Ma)为最主要的生长期,徐西断层的平均生长速率为35m/Ma,宋西断层的平均生长速率为71m/Ma,断陷边界断裂总体平均生长速率大于60m/Ma,两条断层主要呈现独立生长状态,只在重叠的部位发生微弱的软连接;营城期(126~136Ma)也是主要的生长期,徐西断层的平均生长速率为18m/Ma,宋西断层的平均生长速率为85m/Ma,二者发生硬连接,并基本结束了硬连接过程,以重叠处宋西断层的强烈活动为特征,断陷盆地的规模逐渐扩大,沉积厚度随之增加;营城期后断层只在局部连接地点发生微弱活动。断层生长过程中伴生构造的位置基本与油气田的分布相吻合,对它的深入研究将有助于油气勘探。
The Xujiaweizi faulting depression lies in the central part of the Songliao Basin.It is controlled by Songxi and Xuxi faults.Based on the geologic interpretations of the seismic reflection data,we have investigated the growth rate and the evolution of the master faults forming basin boundaries by applying the method of analyzing the relationship of displacement-length along strike of normal faults and the approaches for analyzing growth rate along dip direction.It is revealed that the faults formed mainly in the Shahezi Period.The average growth rate of fault is estimated to be 35 m/Ma and 71 m/Ma for Xuxi and Songxi respectively and larger than 60 m/Ma for the boundary fault system as a whole.During the Shahezi Period,Songxi and Xuxi faults were developed independently with a little soft link around their overlapping part.The Yingcheng Period was another important stage with much more intensive activities of Songxi fault,leading to a larger and deeper faulting depression with thicker sediments infilling.The average growth rate of fault was 18 m/Ma for Xuxi,and 85 m/Ma for Songxi.Hard link occurred between them.Only weak and local faulting activity occurred around some linking areas after the Yingcheng Period.The oil and gas fields are mainly located in the areas where secondary tectonic element developed.This finding bears important implications for the further oil and gas exploration in Xujiaweizi Area.
引文
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