松辽盆地梨树断陷盆地模拟及含油气系统分析

发布时间：2018-04-03 04:13

本文选题：梨树断陷　切入点：烃源岩　出处：《西安石油大学》2017年硕士论文

【摘要】：梨树断陷位于松辽盆地东南隆起区,总面积约2346km2。该断陷发育沙河子组和营城组两套主力烃源岩,上述两套烃源岩有机质丰度大、油气勘探前景好,但前人对上述两套烃源岩成熟度史及其区域差异性缺乏深入对比分析。本文在对沙河子组和营城组两套烃源岩地球化学特征进行评价基础上,利用PetroMod盆地模拟软件对两套烃源岩进行了单井(12口)和二维剖面(7条)的成熟度史模拟,对比了其差异性,进行了梨树断陷含油气系统的分析,并对油气成藏有利区进行了预测。研究表明:(1)典型单井成熟度史模拟结果表明:梨树断陷各构造单元两套烃源岩成熟度史存在较大差别。其中,桑树台洼陷带的有机质热演化程度最高,目前沙河子组烃源岩处于过成熟阶段,营城组烃源岩处于生干气阶段;中央构造带有机质热演化程度次之,目前沙河子组和营城组烃源岩都处于生湿气阶段;北部斜坡带和双龙次洼带沙河子组和营城组烃源岩目前均处于生油阶段;(2)二维剖面成熟度史图模拟结果表明:(1)沙河子组烃源岩在桑树台洼陷带、中央构造带和东部斜坡带均进入成熟阶段。其中,除桑树台洼陷带处于过成熟阶段外,其它构造单元均处于生油气阶段,中央构造带和东部斜坡带处于生油-生湿气阶段,北部斜坡带整体处于低成熟生油阶段,双龙次洼带整体处于生烃高峰期。(2)营城组烃源岩,除了北部斜坡带和双龙次洼带少部分区域处于未成熟阶段外,其它构造单元均已成熟,其中桑树台洼陷带的大部分区域已经进入高成熟-过成熟阶段,中央构造带和东部斜坡带南部进入高成熟阶段;(3)根据沙河子组和营城组烃源岩平面分布图和该两组烃源岩成熟度史分布图和含油气系统的分析,预测了3个有利区,分别为:(1)中央构造带和东南斜坡带中部I类有利成藏区,(2)桑树台洼陷带西部II类有利成藏区,(3)双龙次洼带南部III类有利成藏区。
[Abstract]:Lish fault depression is located in the southeast uplift area of Songliao Basin with a total area of 2346 km ~ 2.The two main source rocks of Shahezi formation and Yingcheng formation are developed in this fault depression. The two sets of source rocks are rich in organic matter and have good prospects for oil and gas exploration. However, there is a lack of in-depth comparative analysis on the maturity history and regional differences of these two sets of source rocks.Based on the evaluation of geochemical characteristics of two sets of source rocks in Shahezi formation and Yingcheng formation, the maturity history of two sets of source rocks are simulated by using PetroMod basin simulation software.In this paper, the oil and gas bearing system in Lishu fault depression is analyzed, and the favorable areas for oil and gas accumulation are predicted.The results show that the maturity history of typical single well is different between two sets of hydrocarbon source rocks in each tectonic unit of Lishu fault depression.At present, the source rocks of Shahezi formation are in the over-mature stage, the source rocks of Yingcheng formation are in the dry gas generation stage, and the thermal evolution of organic matter in the central tectonic belt is the second.At present, the source rocks of Shahezi formation and Yingcheng formation are in the stage of wet gas generation.The source rocks of Shahezi formation and Yingcheng formation in the northern slope and Shuanglongzi subzones are in the oil generation stage at present. The results of the 2-D profile maturity history simulation show that the source rocks of the Shahezi formation are in the Sangshutai depression, and the results show that the source rocks of the Shahezi formation are in the sag of Sangshutai sag.Both the central structural zone and the eastern slope zone are in mature stage.Except for Sangshoutai sag, the other structural units are in the oil-gas generation stage, the central structural belt and the eastern slope belt are in the oil-generating and wet-generating stage, and the northern slope belt is in the low mature oil generation stage.The Shuanglong sub-depression zone is in the peak period of hydrocarbon generation. The source rock of Yingcheng formation, except for a few areas of the northern slope belt and Shuanglong sub-depression belt, is in immature stage, and the other tectonic units are all mature.Among them, most areas of mulberry sag have entered the stage of high maturation and over maturation.The central structural belt and the south of the eastern slope belt have entered a high maturity stage. According to the plane distribution map of source rocks of Shahezi formation and Yingcheng formation, the maturity history distribution map of these two groups of source rocks and the analysis of hydrocarbon bearing systems, three favorable areas are predicted.In the middle of the central structural belt and the southeastern slope belt, the type I favorable reservoir forming area is type I, and the second type is the type II favorable reservoir forming area in the western part of the Sangshutai sag. The type III favorable reservoir forming area is located in the south of the Shuanglongzi depression.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.13

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