镇北地区三叠系延长组长8油层组低渗透储层地质研究

发布时间：2018-06-25 00:24

本文选题：镇北地区 + 沉积微相　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：随着世界油气勘探和开发形势的日益严峻,低渗透油藏的地位显得越来越重要。但因低渗透油藏有其特殊的地质特征,例如储层物性差,成熟度低,孔喉半径小,成岩差异大,应力敏感性强,裂缝比较发育和非均质性强等,使得其开发生产规律与常规油藏有所差别而难以预测。因此,对低渗透储层地质特征进行详尽描述对摸清其油气富集规律有重要作用。鄂尔多斯盆地镇北地区延长组长8油层组是典型的低渗-特低渗油藏,自投产以来已有十余年,目前对其砂体展布特征及剩余油富集规律仍有不确定性。本文以长81油层为例,根据镇北地区区域地质资料,运用开发地质学的方法和油藏工程方法,从储层细分对比入手,研究其沉积微相、微观储层特征以及非均质性等地质特征,并结合生产动态资料,从地质因素和开发因素两个方面,分析其剩余油形成和分布规律,找出其主控因素。研究结果表明,研究区长81段可识别出辫状河三角洲前缘水下分流河道、水下分流河道间、河口坝及远砂坝等微相类型;沉积后期经历了复杂且强烈的成岩作用,致使其孔、渗性低下,孔隙结构复杂,孔喉细小,且次生孔隙较发育;储层的层内和平面非均质性较强,层间非均质性较弱;剩余油分布在总体上主要受沉积微相控制,主力微相仍是剩余油的主要富集区域,在局部区域上还受物性差异、微构造、隔夹层等储层非均质因素控制,使得局部区域上剩余油分布复杂化。
[Abstract]:With the increasingly severe situation of oil and gas exploration and development in the world, the status of low permeability reservoirs is becoming more and more important. However, low permeability reservoirs have their special geological characteristics, such as poor reservoir physical properties, low maturity, small pore throat radius, large diagenetic differences, strong stress sensitivity, relatively developed fractures and strong heterogeneity, etc. The rules of development and production are different from those of conventional reservoirs and are difficult to predict. Therefore, a detailed description of the geological characteristics of low permeability reservoirs is of great importance in understanding the oil and gas accumulation law. Yanchang formation No. 8 in Zhenbei area, Ordos Basin, is a typical low-permeability and ultra-low permeability reservoir, which has been put into production for more than ten years. At present, the distribution characteristics of sand bodies and the law of remaining oil enrichment are still uncertain. In this paper, taking Chang81 reservoir as an example, according to the regional geological data of Zhenbei area, using the method of development geology and reservoir engineering, starting with reservoir subdivision and contrast, the geological characteristics of sedimentary microfacies, microscopic reservoir and heterogeneity are studied. Combined with the production dynamic data, the formation and distribution of residual oil are analyzed from two aspects of geological factors and development factors, and the main controlling factors are found out. The results show that the braided river delta front underwater distributary channel, the estuarine dam and the far sand dam can be identified in the Chang 81 formation of the study area, and the late sedimentary period has experienced complex and strong diagenesis, resulting in the pore. The permeability is low, the pore structure is complex, the pore throat is small, and the secondary porosity is relatively developed; the reservoir has strong heterogeneity in layer and plane, and the heterogeneity between layers is weak; the distribution of remaining oil is mainly controlled by sedimentary microfacies, and the distribution of residual oil is mainly controlled by sedimentary microfacies, and the distribution of residual oil is mainly controlled by sedimentary microfacies. The main microfacies are still the main enrichment area of the remaining oil, and the remaining oil distribution in the local area is complicated by the heterogeneity factors such as physical property difference, microstructure, intercalation and other reservoir heterogeneity factors.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE311;P618.13

【相似文献】