塔中西部地区中奥陶统一间房组沉积特征及储层分布研究

发布时间：2018-02-25 06:32

  本文关键词： 沉积特征 主控因素 储层分布 中奥陶统 一间房组 塔中西部地区　出处：《西南石油大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文通过调研大量的国内外文献,以碳酸盐沉积学、古生物学以及碳酸盐储层地质学等新理论及新方法为指导,采用宏、微观相结合的研究方法,在岩心精细观察描述、薄片鉴定分析的基础之上,充分利用现场钻、录井资料和测井、地震资料,对塔中西部地区中奥陶统一间房组地层的分布规律、沉积相主要类型及发育分布规律、储层特征描述、储层评价、储层主控因素及储层预测等方面进行了综合研究。 通过古生物化石标志分析,发现塔中西部地区原良里塔格组地层下部部分为中奥陶统一间房组地层,因此,对该地层的沉积特征和储层分布研究成为一个亟需解决的问题。在新的地层划分对比方案的基础上,对研究区一间房组地层进行了划分对比,结合区域构造特征和地震资料,分析了一间房组地层在平面上的分布情况及厚度变化；综合分析各种沉积相识别标志,发现一间房组沉积时期主要为开阔台地相沉积,包括台内滩、滩间海等亚相,纵向上表现为台内滩与滩间海相互叠置,具有多旋回组合的特点；横向上台内滩体厚度较大、连续性好,滩间海亚相发育相对较少,主要发育在一间房组地层中下部。 结合塔中西部地区中奥陶统一间房组滩体储层物性特征、储渗空间类型等多方面详细分析,认为研究区一间房组滩体储层主要为孔洞型储层,裂缝-孔洞型储层也较发育,裂缝型储层不太发育,少量洞穴型储层主要发育在一间房组顶部。依据储层评价标准,对研究区单井储层进行评价,发现储层主要为Ⅲ类储层,Ⅰ、Ⅱ类储层不太发育,所占比例不高。储层主要分布在一间房组中上部,横向连续性较好,井间可对比,中下部储层不太发育。 研究区储层的发育情况受岩性岩相组合、风化壳岩溶作用、埋藏岩溶作用及构造断裂活动等多种因素的控制。其中岩性岩相组合时储层发育的物质基础,研究区大面积的滩体沉积有利于储层的发育；风化壳岩溶作用是形成优质储层的根本原因,形成了大量的溶蚀孔洞、洞穴,储层最发育区位于水平潜流岩溶带；埋藏岩溶作用改善了先期形成的孔洞和裂缝,极大程度提高了储层的储渗性能；裂缝及断裂提高了储层的渗流性能,促进了后期岩溶作用的发育。 综合多种因素分析,对塔中西部地区一间房组储层有利发育区进行了预测,发现：储层有利发育主要沿区断裂方向发育,储层次有利发育区分布面积大,较连续,而储层不利发育区主要分布在低能沉积相带及断裂欠发育区域。这些认识可为研究区一间房组进一步的勘探和开发提供地质依据。
[Abstract]:In this paper, a large number of domestic and foreign documents are investigated, and the new theories and methods of carbonate sedimentology, paleontology and carbonate reservoir geology are taken as the guidance, and the macro and micro research methods are adopted to observe and describe the core carefully. On the basis of sheet identification and analysis, using field drilling, logging data, well logging and seismic data, the distribution law of formation, main types of sedimentary facies and their development and distribution in the middle and middle part of the central and western part of the Tarim Basin are studied. Reservoir characteristics description, reservoir evaluation, reservoir control factors and reservoir prediction are comprehensively studied. Based on the analysis of fossil fossil markers, it is found that the lower part of the strata of the former Lianglitag formation in the central and western parts of the Tarim Basin is the Middle Ordovician United Intermediate formation. The study of sedimentary characteristics and reservoir distribution of this formation is an urgent problem to be solved. On the basis of the new stratigraphic division and correlation scheme, the strata of Yijianfang formation in the study area are divided and correlated, combining with the regional structural characteristics and seismic data. This paper analyzes the distribution and thickness change of the strata in the plane of the Yijianfang formation, and synthetically analyzes the identification marks of various sedimentary facies, and finds that the sedimentary period of the Yijianfang formation is mainly composed of the open platform facies, including the subfacies of the platform beach and the interbeach sea, etc. Longitudinally, it is shown that the beach and the intertidal sea overlap each other, which has the characteristics of polycyclic assemblage, and the horizontal inner beach body is thicker and has good continuity, and the subfacies between the beaches are relatively less developed, mainly in the middle and lower part of the strata of the Yijianfang formation. Based on the detailed analysis of the reservoir physical properties and the types of storage and permeability space in the middle and middle Ordovician Intermediate formation in the central and western part of the Tarim Basin, it is considered that the beach body reservoir of the Yijianfang formation in the study area is mainly a porosity type reservoir, and the fracture-pore type reservoir is also relatively developed. The fractured reservoir is not very developed, and a small number of cavernous reservoirs are mainly developed at the top of one chamber formation. According to the reservoir evaluation criteria, the single well reservoir in the study area is evaluated. It is found that the reservoir is mainly type 鈪，

本文编号：1533399