海拉尔盆地乌南凹陷南二段构造、砂体分布特征及有利区预测

发布时间：2018-04-09 00:11

本文选题：乌尔逊凹陷　切入点：南二段　出处：《东北石油大学》2017年硕士论文

【摘要】：本文采用油气地质综合研究方法,结合前人研究成果,对海拉尔盆地乌尔逊凹陷乌南次凹南二段油层进行精细构造解释和地震储层预测。结合沉积相研究成果,对目标区储层展布刻画。通过分析油气成藏条件,油气的分布规律,确定了该区南二段成藏模式,进而预测有利圈闭。研究表明,乌南凹陷属于复杂断块油田,断层多、密度大、断块小,受复杂断裂系统控制,工区内发育断鼻、断块构造型圈闭,且圈闭受断层控制或因断层遮挡而形成,圈闭分布具有规模大、成排成带分布特点;岩心和测录井资料表明,南二段发育辫状河三角洲-浊积扇-深湖、半深湖沉积体系,南二段早期全区不同程度受到正东方向物源影响,东南方向砂体延伸范围较小,西北方向砂体发育。南二段晚期受到西北、东北、东南、正东四个方向物源交汇影,井间砂体变化大,砂体互相叠置,砂体展布规律较难确定。依据前人研究成果,南二段烃源岩广泛分布,以南一段发育的暗色泥岩最佳,且烃源岩分布与砂体分布匹配关系较好,储集层围绕生油洼槽呈环带状分布,油气向四周斜坡带及陡坡带垂向运移,受断裂影响较大,发育岩性油藏、构造-岩性油藏、构造油藏。乌南地区可划分为4个油气运聚单元,乌东斜坡带是最有利的油气运聚单元。在以上研究基础上,对乌南地区南二段油层发育区带进行预测,发现3个区带,落实15个圈闭,对乌南凹陷南二段下一步勘探开发有较大的指导和借鉴意义。
[Abstract]:In this paper, the oil and gas geology comprehensive research method is adopted, combined with the previous research results, the fine structural interpretation and seismic reservoir prediction of the southern member of the Wunan subconcave in the Wuerxun depression, Hailaer Basin, are carried out.Combined with the results of sedimentary facies research, the reservoir distribution in the target area is described.By analyzing the oil and gas accumulation conditions and the distribution law of oil and gas, the reservoir forming model of the southern member of the area is determined, and the favorable traps are predicted.The study shows that Wunan sag belongs to complex fault block oilfield, with many faults, high density, small fault block, controlled by complex fault system, fault nose developed in the working area, fault block structural trap, and the trap is controlled by fault or formed due to fault occlusion.The distribution of traps has the characteristics of large scale and zonal distribution in rows, the core and logging data show that braided river deltas, turbidite fans, deep lakes and semi-deep lake sedimentary systems are developed in the southern member of the second member.In the early stage of the southern second member, the whole area was affected by the provenance in the east direction, the extension range of the sand body in the southeast direction was relatively small, and the sand body developed in the northwest direction.The late stage of the second member of the south is influenced by the intersection of material sources in the northwest, northeast, southeast and east, and the cross-well sand bodies change greatly, the sand bodies overlap each other, and the distribution of sand bodies is difficult to determine.According to the previous research results, the source rocks of the South member are widely distributed, the dark mudstone developed in the south section is the best, and the distribution of the source rocks matches well with the distribution of the sand bodies.The vertical migration of oil and gas along the slope zone and steep slope zone is greatly influenced by faults, and lithologic reservoirs, tectonic-lithologic reservoirs and structural reservoirs are developed.The area can be divided into 4 oil and gas migration and accumulation units, and the Wudong slope is the most favorable hydrocarbon migration and accumulation unit.On the basis of the above research, the development zones of the South member of the South member of the Wunan area are predicted, 3 zones are found and 15 traps are implemented, which is of great significance for the further exploration and development of the second member of the South member of the Wunan Sag.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

【相似文献】