构造斜坡部位煤层气直井储层空间形态研究

发布时间：2018-05-01 14:02

本文选题：潘庄区块 + 构造斜坡　；参考：《中国矿业大学》2017年硕士论文

【摘要】：构造斜坡是指受区域构造运动或局部构造隆升作用形成的、上部以剥蚀为主,下部沉积埋藏的斜坡区,是含油气盆地中一类非常重要的构造单元,位于隆起到凹陷间,是盆缘、盆内砂体堆积的主要地带,也是大型岩性地层圈闭形成与分布的主要场所。本文选择沁水盆地潘庄区块煤层气开发示范区内的生产井作为研究对象,采集该区主要储层地质因素、主要储层参数及排采历史资料,通过“煤层气储层开发动态评价软件系统”软件与COMET3软件对煤层气井进行数值模拟,分析储层参数的敏感性,建立了单井形态空间模型以及储层地质模型,在此基础上结合GIS技术建立研究区的TIN模型并对研究区进行坡度分类,分析构造斜坡部位在直井开发时储层空间形态的变化,研究了构造斜坡不同部位对单井排采时的储层空间形态的影响,取得了以下结论:(1)利用GIS软件对研究区煤层气储层原始数据进行预处理,分别提取3#煤层埋深、煤层厚度、含气量等值线并建立TIN模型,对研究区3#煤储层进行坡度划分。以潘庄西区4口煤层气排采井为研究对象,其坡度分布情况为PZC-04、PZC-05、PZC-06井位于0~5°的微缓斜坡上,PZC-03井位于5°~8°的较缓斜坡上。(2)结合储层敏感性分析,使用“煤层气储层开发动态评价软件系统”分析了不同渗透率及渗透率的方向性差异对单井排采储层压力分布的影响。从储层压力变化情况看出,排采初期研究区储层压力整体下降,但总体储层压力仍然大于临界解吸压力,之后在井筒附近的吸附气解吸较为明显,形成明显的压降漏斗;渗透率的方向性差异对单井储层压力分布形态的影响较大,储层压降漏斗在渗透率优势方向产生明显的正效应。(3)依据研究区储层坡度分布模型、排采井位置分布现状,结合储层的不同构造斜坡部位建立布井比选方案,通过数值模拟结果及单井储层压力空间分布形态情况得知,在研究区内向斜中部产气量高于其他部位产气量;相同构造部位坡度越大产气量越高,坡度过渡带产气量高于同坡度值的非坡度过渡带的产气量;相同构造部位且坡度带相同的区域,坡度值越高产气量越大,煤层底板标高越高产气量越大。
[Abstract]:Structural slope is formed by regional tectonic movement or local tectonic uplift. The upper slope is mainly denudated and the lower sedimentary slope is buried. It is a kind of very important structural unit in oil-bearing basin, which is located between uplift and depression and is the margin of basin. The main area of sand accumulation in basin is also the main place of formation and distribution of large lithostratigraphic traps. In this paper, the production wells in the coal-bed methane development demonstration area of Panzhuang block in Qinshui Basin are selected as the research objects, and the main reservoir geological factors, main reservoir parameters and historical data of drainage and production are collected. Through the numerical simulation of coalbed methane wells by "CBM reservoir development dynamic evaluation software system" and COMET3 software, the sensitivity of reservoir parameters is analyzed, and the single well morphological spatial model and reservoir geological model are established. On the basis of this, the TIN model of the study area is established with the GIS technology, and the slope classification of the study area is carried out, and the change of the reservoir spatial morphology of the structural slope during the development of the vertical well is analyzed. In this paper, the influence of different parts of structural slope on reservoir spatial morphology of single well drainage is studied. The following conclusions are obtained: (1) preprocessing the original data of coalbed methane reservoir in the study area by using GIS software, and extracting coal seam depth and coal seam thickness respectively. Based on the contour of gas content and TIN model, the slope of coal reservoir in the study area was divided. Taking 4 coal-bed methane drainage wells in Panzhuang Western region as the research object, the slope distribution of PZC-04 and PZC-05and PZC-06 wells is analyzed in combination with reservoir sensitivity analysis, which is located on a gentle slope of 0 掳5 掳. PZC-03 well is located on a slower slope of 5 掳or 8 掳. In this paper, the influence of different permeability and directivity difference on the pressure distribution of single well drainage reservoir is analyzed by using the "Coal bed methane Reservoir Development dynamic Evaluation system". It can be seen from the variation of reservoir pressure that the reservoir pressure in the study area at the early stage of drainage and production decreases as a whole, but the overall reservoir pressure is still greater than the critical desorption pressure, and then the adsorption gas desorption near the wellbore is more obvious, forming an obvious pressure drop funnel. The directional difference of permeability has a great influence on the pressure distribution pattern of single well reservoir. The reservoir pressure drop funnel has obvious positive effect in the dominant direction of permeability. Combined with the different structural slopes of the reservoir, the well distribution scheme was established. Through the numerical simulation results and the spatial distribution of single well reservoir pressure, the gas production in the central syncline was higher than that in the other parts. The higher the slope of the same structure is, the higher the gas production in the transition zone is, the higher the gas production in the non-slope transitional zone with the same slope value, the higher the gas yield in the same structural area and the same slope zone. The higher the height of coal seam floor, the greater the volume of gas.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD841

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