金湖凹陷南部控藏断层封闭性研究及应用

发布时间：2018-07-08 17:40

本文选题：金湖凹陷 + 构造特征　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：金湖凹陷位于苏北盆地的东台坳陷西部,是苏北盆地的主要油气富集单元之一。凹陷的南部断裂系统极其发育,断裂对油气藏形成起到至关重要的作用,现已发现的油气藏主要为断鼻和断块油气藏。因此,寻找构造油气藏仍然是金湖凹陷小断块油气藏勘探的重中之重。在沉积学、构造地质学以及石油地质学的基础上,结合地震资料、岩心资料和测井资料,对研究区内的构造特征、沉积特征以及断层的封闭性展开研究。通过三维地震解释,对研究区内断层进行精细解释,并将断层划分为四个级别,其中,最为发育的为三级断层;断层的平面组合样式主要为平行式、斜交式、雁列式和马尾状,剖面组合样式主要有“Y”字形、地堑和地垒以及阶梯状。通过地层对比,绘制研究区地层等厚图、砂体等厚度,分析储层发育规律,并结合岩心观察资料,最后确定研究区沉积相发育规律:阜二段主要为滨浅湖亚相,阜三段主要为三角洲前缘亚相,阜四段下部为三角洲前缘亚相,上部则为湖泊相。结合砂、泥岩分布规律,分析生储盖组合:阜二段上部的泥岩和阜四段上部泥岩既可作为良好的烃源岩,又可作为区域性盖层,阜二段下部砂岩和阜四段下部砂岩因具有良好的生储盖组合条件而具有形成油气藏的优越条件;阜三段在纵向上存在多个区域性的盖层。通过岩性对置法、泥岩涂抹因子等对断层的侧向封闭性进行研究,通过断裂带泥质含量法、声波时差法和断面正应力法对断层的垂向封闭性进行研究:汊涧地区侧向封闭性较好,阜四段的垂向封闭性较好,阜三、阜二段垂向封闭性中等;铜城地区侧向封闭性较好,是控制成藏的主要因素,而垂向封闭性中等。通过对油气分布规律研究,发现油气主要聚集在两条断层所形成的扇形断块中,若扇形圈闭中具有良好储层,则很可能会形成油气藏。因此,结合沉积相展布情况,优选孔渗性好的扇形断块,可以对有利目标进行预测。
[Abstract]:Jinhu sag is located in the west of Dongtai depression in Subei basin and is one of the main oil and gas enrichment units in Subei basin. The fault system in the southern part of the sag is very developed and the fault plays an important role in the formation of oil and gas reservoirs. The oil and gas reservoirs discovered now are mainly fault-nose and fault-block reservoirs. Therefore, finding structural reservoirs is still the most important part of exploration for small fault blocks in Jinhu sag. On the basis of sedimentology, structural geology and petroleum geology, combined with seismic data, core data and logging data, the structural characteristics, sedimentary characteristics and sealing characteristics of faults in the study area are studied. Through 3D seismic interpretation, fine interpretation of faults in the study area was carried out, and the faults were divided into four levels, among which the most developed were third-grade faults, and the plane combination styles of the faults were mainly parallel, oblique, echelon and horsetail. The cross-section combination is mainly Y-shaped, graben and barrier and ladder-shaped. Through stratigraphic correlation, drawing stratigraphic map of equal thickness and thickness of sand body in the study area, analyzing the law of reservoir development, and combining with core observation data, finally determining the regularity of sedimentary facies development in the study area: the second member of Fu2 is mainly a subfacies of littoral shallow lake, The main subfacies of the third member is delta front, the lower part of Fu4 is delta front, the upper is lacustrine. Combined with the distribution law of sand and mudstone, the authors analyze the assemblage of source reservoir and caprock: the mudstone in the upper part of the second member of Fu2 and the upper mudstone of the 4th member of Fu can be used as both good source rock and regional caprock. The sandstones of the lower part of the second member of Fu2 and the lower part of the fourth member of Fu4 have favorable conditions for forming oil and gas reservoirs due to their favorable conditions of generation, reservoir and caprock assemblage, and there are several regional caprocks in the longitudinal direction of the third member of FU. The lateral sealing of faults is studied by lithologic contrast method, mudstone smear factor, and shale content method in fault zone. The vertical sealing properties of faults are studied by acoustic moveout method and section normal stress method: the lateral sealing is better in Jijian area, the vertical sealing is better in the fourth member of Fu, the vertical sealing is moderate in the third and second member of Fu, and the lateral sealing is better in Tongcheng area. It is the main factor to control the accumulation, while the vertical closure is moderate. By studying the distribution of oil and gas, it is found that oil and gas are mainly concentrated in the fan-shaped fault blocks formed by two faults. If there are good reservoirs in the fan-shaped traps, oil and gas reservoirs are likely to be formed. Therefore, combined with the distribution of sedimentary facies, a sector fault block with good porosity and permeability can be selected to predict the favorable target.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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