北海盆地维京地堑渐新统砂岩侵入体形态特征及成因
发布时间：2018-12-27 09:16
【摘要】：砂岩侵入体是由处于浅埋藏阶段、尚未固结的砂质沉积物发生液化并侵入到上覆盖层所形成的一类软沉积物变形,在北海盆地维京地堑渐新统地层中非常发育。为探讨砂岩侵入体的形态特征及诱发机制,通过高分辨率三维地震及测井资料,利用地震反射结构分析、地震相干切片等手段对砂岩侵入现象进行了识别;并结合多边形断层系统、流体充注与砂岩侵入之间的关联性,对砂岩侵入体的成因机制进行了分析。结果表明:在地震剖面上可识别的砂岩侵入体多呈V型或W型强振幅反射特征,其横向展布规模约1~2 km,垂向侵入高度约100~200 m;流体的大规模充注及多边形断层诱发盖层破裂是形成砂体内部超压并诱发其发生液化的关键因素。砂岩侵入体在形成之后可以作为流体运移通道,对强化流体的垂向运移具有重要意义;并且砂岩侵入体本身即可作为油气的有利储集体。因此识别并分析砂岩侵入体的成因机理,对盖层封闭性评价及油气勘探具有重要指导意义。
[Abstract]:Sandstone intrusion is a kind of soft sediment deformation formed by liquefaction of unconsolidated sandy sediments in shallow burial stage and invading to the upper overburden. It is very developed in the Oligocene strata of Viking graben in Beihai Basin. In order to study the morphological characteristics and inducing mechanism of sandstone intrusions, the sandstone intrusions are identified by means of high-resolution 3-D seismic and logging data, seismic reflection structure analysis and seismic coherence slicing. The genetic mechanism of sandstone intrusion is analyzed by considering the correlation between fluid filling and sandstone intrusion in polygonal fault system. The results show that the sandstone intrusions which can be identified on the seismic profile are mostly V-type or W-type strong amplitude reflection characteristics, and their lateral distribution scale is about 1 / 2 km, vertical invasion height is about 100m ~ 200m; Large-scale fluid filling and polygonal fault induced caprock fracture are the key factors to form overpressure in sand body and induce liquefaction. Sandstone intrusions can be used as fluid migration channels after formation, which is of great significance for strengthening vertical migration of fluids, and sandstone intrusions themselves can be used as favorable reservoir for oil and gas. Therefore, identifying and analyzing the genetic mechanism of sandstone intrusions is of great significance to the evaluation of sealing property of caprock and oil and gas exploration.
【作者单位】： 中国石油大学(北京)油气资源与探测国家重点实验室;中国石油大学(北京)地球科学学院;
【基金】：国家自然科学基金项目(41672098)~~
【分类号】：P618.13
[Abstract]:Sandstone intrusion is a kind of soft sediment deformation formed by liquefaction of unconsolidated sandy sediments in shallow burial stage and invading to the upper overburden. It is very developed in the Oligocene strata of Viking graben in Beihai Basin. In order to study the morphological characteristics and inducing mechanism of sandstone intrusions, the sandstone intrusions are identified by means of high-resolution 3-D seismic and logging data, seismic reflection structure analysis and seismic coherence slicing. The genetic mechanism of sandstone intrusion is analyzed by considering the correlation between fluid filling and sandstone intrusion in polygonal fault system. The results show that the sandstone intrusions which can be identified on the seismic profile are mostly V-type or W-type strong amplitude reflection characteristics, and their lateral distribution scale is about 1 / 2 km, vertical invasion height is about 100m ~ 200m; Large-scale fluid filling and polygonal fault induced caprock fracture are the key factors to form overpressure in sand body and induce liquefaction. Sandstone intrusions can be used as fluid migration channels after formation, which is of great significance for strengthening vertical migration of fluids, and sandstone intrusions themselves can be used as favorable reservoir for oil and gas. Therefore, identifying and analyzing the genetic mechanism of sandstone intrusions is of great significance to the evaluation of sealing property of caprock and oil and gas exploration.
【作者单位】： 中国石油大学(北京)油气资源与探测国家重点实验室;中国石油大学(北京)地球科学学院;
【基金】：国家自然科学基金项目(41672098)~~
【分类号】：P618.13
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