蠡县斜坡北段沙一下成藏过程研究

发布时间：2018-06-20 00:55

本文选题：蠡县斜坡北段 + 烃源岩评价　；参考：《长江大学》2015年硕士论文

【摘要】：蠡县斜坡位于冀中坳陷中部饶阳凹陷西部的次级构造,是一个在前古近纪古隆起上发育起来的西抬东倾、北东走向的继承性宽缓沉积斜坡,是近年来油气评价的重点地区。斜坡北段地区虽然油气较为聚集,但平面分布比较分散。区内油气成藏条件复杂多变,多年勘探研究显示该区主要烃源岩为沙三段烃源岩和沙一段烃源岩,主力烃源岩为沙一下亚段烃源岩,但是具体油气来源,油气运移及成藏模式都未有清楚统一的认识。蠡县斜坡北段具有十分有利的油气成藏条件和较大的资源潜力,但随着勘探的不断深入,勘探难度亦不断增大。为明确下一步勘探方向、选择勘探目标,我们必须要对该地区的成藏条件过程有更加明确的认识。本硕士论文是在充分收集前人对饶阳凹陷区域构造、层序、沉积、储层等研究的基础上,针对饶阳凹陷蠡县斜坡北段Es1下存在的问题,以石油地质学、油气地球化学、含油气系统与成藏动力学为理论指导,采集样品做烃源岩地化分析及流体包裹体分析,对蠡县斜坡北段油气分布特征、油气来源和油气藏形成期次等进行研究,厘清斜坡北段Es1下油气成藏过程。整个论文主要运用油源对比以及流体包裹体方法分析蠡县斜坡北段沙一下成藏过程。烃源岩特征中主要分析收集到的烃源岩有机质丰度、类型、成熟度以及埋藏史数据。根据所得数据做油源对比分析该区油气主要来源。流体包裹体系统分析确定研究区油气充注期次及成藏时间,确定油气运移路径及成藏模式,从而分析整个成藏过程。烃源岩分析可知,蠡县斜坡北段Es 1下烃源岩有机质类型好,丰度高,生油潜力大。油多处于未熟晚期-低熟早期,烃源层分布范围广。抽取的28个样品原油和泥岩油源对比显示,原油样品的奇偶优势不明显,植烷优势明显,伽马蜡烷含量相对较高,表现出原油形成于咸水还原沉积环境,甾烷成熟度等参数揭示原油显示出未熟-低熟的特征。流体包裹体系统分析法,根据油包裹体荧光光谱特征以及光谱参数显示出研究区烃类包裹体荧光颜色有黄绿和蓝绿两种。说明该地区至少发生过两幕油气充注。同时部分样品中可检测到固态沥青,说明该地区早期充注油藏遭受过破坏。早期捕获的发黄绿色荧光油包裹体代表该区的第一期成藏。捕获的第二期以发蓝绿色荧光油包裹体代表该区的第二期成藏。利用油包裹体成熟度参数进行的油气运移方向追踪显示,靠近生烃带的部位两期油气充注时间均比较早,远离生烃带的部位均相对较晚,据此推测烃源岩生成的油气经G42井向北运移至G59井区,其主体方向是由SE向NW运移。
[Abstract]:The Lixian County slope is located in the secondary structure of the western Raoyang depression in the central Jizhong depression. It is a inheriting and slow sedimentary slope of the Western uplift in the former Palaeogene paleo uplift. It is the key area for the evaluation of oil and gas in recent years. Although the oil and gas are more concentrated in the northern section of the slope, the plane distribution is relatively scattered. The oil in the area is scattered. The gas accumulation conditions are complex and changeable. The main hydrocarbon source rocks in this area are three hydrocarbon source rocks and S1 hydrocarbon source rocks in this area. The main source rock is the subsection of sand source rocks. However, there is no clear and unified understanding of the main hydrocarbon source rocks, oil and gas migration and reservoir formation modes. The northern section of Lixian County slope has very favorable conditions for oil and gas accumulation. In order to clear the next exploration direction and select the exploration target, we must have a more clear understanding of the process of the reservoir forming conditions in this area. The master's thesis is to fully collect the predecessors' regional structure, sequence, deposition and reservoir in the Raoyang depression. On the basis of the study, in view of the problems existing in the northern section of the Lixian County slope in the Raoyang sag, the petroleum geology, oil and gas geochemistry, oil and gas system and reservoir formation dynamics are the theoretical guidance, and the samples are collected for the analysis of source rock geochemistry and fluid inclusion analysis, and the oil and gas distribution characteristics, the oil and gas sources and the formation period of the oil and gas reservoirs in the northern section of the Lixian County slope are made. The process of oil and gas accumulation under Es1 in the northern section of the slope is clarified. The whole paper mainly uses oil source contrast and fluid inclusion method to analyze the process of sand formation in the northern section of the Lixian County slope. The main characteristics of the source rock are the abundance, type, maturity and burial history of the collected source rocks. The oil and gas sources are compared and analyzed in this area. The fluid inclusion system is used to determine the period of oil and gas filling and the accumulation time, determine the migration path and reservoir pattern, and then analyze the whole process of reservoir formation. The source rock analysis of the hydrocarbon source rock shows that the Es 1 source rocks in the northern section of the Lixian County slope have good organic type, high abundance, high oil potential and more oil potential. In the unripe late stage, the hydrocarbon source layer is widely distributed in the early stage of low maturity. The comparison of 28 samples of crude oil and mudstone oil shows that the odd and even advantages of the crude oil are not obvious, the predominance of the alkane is obvious, the content of the gamma wax is relatively high, and the crude oil is formed in the environment of the reduction and deposition of salt water, and the parameters of sterane maturity reveal that crude oil is unripe. The characteristics of low maturity. Fluid inclusion system analysis, according to the fluorescence spectrum characteristics and spectral parameters of oil inclusions, it shows that the fluorescence color of hydrocarbon inclusions in the study area has two kinds of yellow green and blue green. It shows that at least two episodes of oil and gas are filled in this area. At the same time, some samples can be detected in solid bitumen, indicating the early filling reservoir in this area. The early harvest of yellow green fluorescent oil inclusions represented the first phase of the area. The second phase of the captured green fluorescent oil inclusions represented second stages of accumulation in the area. The oil and gas migration direction of the oil inclusions maturity parameters showed that the two phases of oil and gas filling near the hydrocarbon generating zone were both of the time of oil and gas filling. Earlier, the parts far away from the hydrocarbon generation zone are relatively late. According to this, it is speculated that the hydrocarbon generated by the source rock is moved northward to the G59 well area through the G42 well, and its main direction is to migrate from SE to NW.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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