南堡凹陷隐蔽油气藏识别及分布规律研究

发布时间：2018-03-22 21:08

本文选题：隐蔽油气藏　切入点：层序地层　出处：《中国地质大学(北京)》2017年博士论文　论文类型：学位论文

【摘要】：针对南堡凹陷高南—杜林地区东一段发现的隐蔽油气藏具有分布规律性差,成藏机制复杂的特点,本文应用层序地层学、地震沉积学、沉积体系分析技术、高分辨率地震反演技术等多种理论方法相结合,开展研究区东一段区域层序研究、目的层段的精细构造解释以及沉积相及沉积体系研究,分析了沉积体系的演化规律。在此基础上通过地震反演等手段对储层进行了预测,识别和评价了隐蔽油气藏并对其分布规律做了总结。采用综合的层序地层分析方法首次识别出四级基准面旋回,建立高分辨率层序地层格架。总结了各个四级层序界面和湖泛面的钻测井及地震剖面特性。将东一段划分为一个三级层序,3个四级层序,对应3个砂层组(Ed11,Ed12,Ed13)。最大湖泛期位于Ed12时期,在四级层序内部根据层序界面及最大湖泛面将东一段划分为6个时间地层单元。研究区沉积了一套以湖相为背景的扇三角沉积体系,确认两大物源体系存在于研究区内,分别来自西南庄断层和高柳断层上升盘。沉积体系及演化特征为:老爷庙扇三角洲横向大规模展布,高南扇三角洲由多个小型扇三角洲群组成。各时期沉积体系物源方向与发育位置多具有继承性;分析了沉积体系分布对隐蔽油气藏形成的控制作用,认为南堡凹陷高南—杜林地区扇三角洲中能够形成大量的隐蔽油气藏。水上溢岸砂体、水下分流河道、远砂坝、滑塌砂体等均可作为良好的储集层,其中远砂坝砂体物性最好,为最有利的钻探目标。分别从(1)主要考虑构造因素、沉积体的横向变化以及沉积体与构造的匹配关系的角度;(2)层序地层学的角度;(3)圈闭发育位置的角度,对研究区隐蔽油气藏进行了划分。总结了油气藏富集规律:纵向上油气主要富集于东一段短期湖泛面上、下(泥包砂段)发育的薄层砂体中;平面上油气富集主要受湖泛面附近的沉积相分布和构造背景控制。提出了“湖泛面控藏”的理论观点,并在此观点指导下,通过提取湖泛面反演属性,对高南斜坡带东一段隐蔽圈闭识别与评价,进一步明确了该区隐蔽油气藏勘探的领域。
[Abstract]:In view of the characteristics of the subtle oil and gas reservoirs found in the east first member of Gaonan-Dulin area in Nanpu Sag, which have poor distribution regularity and complicated reservoir forming mechanism, this paper applies sequence stratigraphy, seismic sedimentology and sedimentary system analysis techniques. Combining high-resolution seismic inversion techniques and other theoretical methods, the study of the regional sequence of the first member of the eastern part of the study area, the fine structural interpretation of the target formation, and the study of sedimentary facies and sedimentary system are carried out. The evolution law of sedimentary system is analyzed. On the basis of this, reservoir is predicted by seismic inversion. The subtle oil and gas reservoirs are identified and evaluated and their distribution laws are summarized. The four-level base-level cycles are identified for the first time by using the comprehensive sequence stratigraphic analysis method. The high-resolution sequence stratigraphic framework is established, and the drilling logging and seismic profile characteristics of each four-order sequence interface and lacustrine pan-surface are summarized. The eastern first member is divided into a third-order sequence, three four-order sequences, and three four-order sequences. The maximum lacustrine flooding period is located in the Ed12 period. The eastern first member is divided into six time stratigraphic units according to the sequence interface and the maximum lake panoramic surface. A set of fan triangle sedimentary system with lacustrine background has been deposited in the study area. It is confirmed that the two major provenance systems exist in the study area, respectively from the upwarping plates of the Southwest Zhuang fault and the Gaoliu fault. The sedimentary system and its evolution are characterized by the large-scale horizontal distribution of the Laoyamiao fan delta, The high-south fan delta is composed of several small fan delta groups. The direction and development position of the sedimentary system are inherited from each stage, and the controlling effect of sedimentary system distribution on the formation of subtle oil and gas reservoirs is analyzed. It is considered that a large number of subtle oil and gas reservoirs can be formed in the fan delta of Gaonan-Dulin area in Nanpu Sag. The overflowing sand body, underwater distributary channel, remote sand dam and sloughed sand body are all considered as good reservoirs, and the sand body of Zhongyuan sand dam has the best physical properties. As the most favorable drilling target, the main structural factors, lateral variation of sedimentary body and the angle of matching relationship between sedimentary body and structure are considered respectively from the angle of sequence stratigraphy. In this paper, the subtle oil and gas reservoirs in the study area are divided. The rules of accumulation of oil and gas reservoirs are summarized: the oil and gas accumulation is mainly in the thin layer sand bodies developed in the short term lake of the first section of the east, and in the lower (mud-wrapped sand section); Oil and gas enrichment on the plane is mainly controlled by sedimentary facies distribution and tectonic background near the lake flooding surface. The theoretical viewpoint of "lake panoramic reservoir control" is put forward. Under the guidance of this viewpoint, the inversion attributes of lake panoramic surface are extracted. The identification and evaluation of the subtle traps in the east section of the Gaonan Slope have further clarified the exploration field of subtle oil and gas reservoirs in this area.
【学位授予单位】：中国地质大学(北京)
【学位级别】：博士
【学位授予年份】：2017
【分类号】：P618.13

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