方正断陷油气成藏要素时空匹配及其控藏作用

发布时间：2018-05-16 05:09

本文选题：方正断陷 + 源岩　；参考：《东北石油大学》2015年硕士论文

【摘要】：方正断陷位于松辽盆地东侧的依舒地堑北段,油气藏整体上呈东西分布,然而对于东西部成藏的差异是什么,油气在不同构造不同层位上受什么因素影响成藏还不是很清楚。因此,分析方正断陷油气成藏要素对油气成藏的控制作用使至关重要的,并且对于认识方正断陷油气分布和勘探具有重要指导意义。在充分利用方正断陷地质、地震、测井和钻井资料的基础上,分析方正断陷油气成藏的要素,主要有源岩、圈闭和输导通道三个方面。通过油藏解剖,明确了油气成藏要素在空间上和时间的匹配关系和类型。空间匹配关系科分为3种:①源内圈,是新安村+乌云组断层遮挡圈闭位于新安村+乌云组源岩内,由砂体侧向连接新安村+乌云组源岩和其内圈闭;②源上圈,是宝一段圈闭位于新安村+乌云组源岩之上,由Ⅵ类断裂垂向连接新安村+乌云组源岩和其上宝一段圈闭;③源下侧圈,是基岩断鼻圈闭或白垩系断圈位于新安村+乌云组源岩之下,由于Ⅵ类断裂侧向连接新安村+乌云组源岩和与其对接基岩或由不整合面侧向连接新安村+乌云组源岩和与其对接的白垩系圈闭。时间匹配关系分为2种:①源岩大量排烃期与断裂活动期匹配关系;②油气运移期与圈闭形成期匹配关系。通过方正断陷东西部油气分布规律的研究,表明纵向上东部在宝泉岭组、新安村+乌云组和基底地层为油气聚集的主要层位,而西部油气主要是在新安村+乌云组和白垩系地层聚集;平面上对比东西部油气分布情况,得出西部含油气性好于东部。在油气分布规律基础上,结合油气成藏要素的时空匹配关系,确定了油气成藏要素时空匹配关系控制油藏的作用有2个方面:①油气成藏要素空间匹配关系控制油气聚集范围和部位,即:(1)源岩分布控制油气的成藏与分布;(2)圈闭类型控制油气藏类型;(3)输导通道控制油气聚集的具体部位;②油气成藏要素时间匹配控制油气聚集程度。
[Abstract]:Fangzheng fault depression is located in the northern section of Yishu graben on the east side of Songliao Basin. The oil and gas reservoirs are distributed east-west as a whole. However, it is not very clear what is the difference between the east and the west and what factors affect the formation of reservoirs in different structural and different strata. Therefore, it is very important to analyze the controlling effect of oil and gas accumulation elements in Fangzheng fault depression on oil and gas accumulation, and it is of great guiding significance to understand the hydrocarbon distribution and exploration in Fangzheng fault depression. On the basis of making full use of the geological, seismic, logging and drilling data of Fangzheng fault depression, the factors of hydrocarbon reservoir formation in Fangzheng fault depression, the main active rocks, traps and transportation channels are analyzed. Through reservoir anatomy, the matching relationship and types of oil and gas accumulation elements in space and time are determined. The family of spatial matching relations is divided into three types: 1 source inner circle. It is located in the source rock of Xinancun Wuyun formation by fault shielding trap, and connects the source rock of Xinancun Wuyun formation and its inner trap Shui2 source circle from the side of the sand body to the source rock of the Wuyun formation of Xinancun formation, which is located in the source rock of the Wuyun formation of Xinancun formation. It is located on the source rock of the Wuyun formation of Xinancun formation, and is vertically connected with the source rock of the Wuyun formation of Xinancun formation by type VI fault and the lower side of the source of the trap No. 3 of its Shangbao formation. The fault nose trap of bedrock or Cretaceous fault circle is located under the source rock of Wuyun formation in Xinancun formation. Due to the lateral connection of type VI faults to the source rocks of the Xinancun Wuyun formation and their docking bedrock or to the Cretaceous traps connected laterally from unconformable surfaces to the source rocks of the Xinancun Wuyun formation. The time matching relationship can be divided into two types: the massive hydrocarbon expulsion stage and the fault activity stage of the source rocks. The oil and gas distribution in the eastern and western parts of the Fangzheng fault depression is studied. It is shown that the east part is in the Baoquanling formation, the Xinancun Wuyun formation and the basement strata are the main horizons of oil and gas accumulation. The oil and gas in the west is mainly concentrated in the Wuyun formation and the Cretaceous strata in Xinancun, and the oil and gas distribution in the eastern and western regions is contrasted on the plane, it is concluded that the hydrocarbon bearing property in the west is better than that in the east. Based on the distribution of oil and gas, combined with the space-time matching relation of oil and gas accumulation elements, It is determined that the spatiotemporal matching relationship of hydrocarbon reservoir forming elements controls the oil and gas accumulation range and position in two aspects: 1. That is, the distribution of source rocks controls the accumulation and distribution of oil and gas. 2) the type of trap controls the type of oil and gas accumulation. (3) the specific location of oil and gas accumulation is controlled by the migration channel. The time matching of oil and gas accumulation elements controls the degree of oil and gas accumulation.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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