桥口东北翼沙三段上8-中2砂组储层特征研究

发布时间：2018-05-21 09:47

  本文选题：桥口东北翼 + 沉积微相　； 参考：《新疆大学》2015年硕士论文

【摘要】：桥口东北翼是桥口油田老区滚动扩边、增储增产的潜力区域之一。受沉积、构造等因素的影响,地层变化大。前人的研究多基于深部地层,浅层主要含油地层沙三段上8-中2砂组的储层特征仍不明确。本文在消化吸收前人研究成果的基础上,运用储层沉积学、石油地质学、地球物理测井等学科的理论和方法,通过岩心观察、薄片鉴定、扫描电镜结合测井、试油资料的分析,对研究区目的层的储层特征进行了较为深入的研究。桥口东北翼沙三段上8-中2砂组共划分为27个小层,其中有8个小层砂岩厚度较大且稳定,为本次研究的主力小层。通过对重矿物、古水流和砂岩成分成熟度的综合分析明确了目的层物源方向,主要来自NE和SW。总结沉积相标志和测井相类型,以物源方向为基础,结合各小层砂岩厚度在全区的分布特征,明确了沉积微相类型主要包括水下分流河道、水下河道侧翼和远砂坝,其中水下分流河道砂体为研究区最为有利砂体。储集岩主要为岩屑长石砂岩,粒径在0.05-0.25mm之间,颗粒分选好-中等。孔隙以溶蚀粒间孔隙和残余原生孔隙为主。平均孔隙度为10.68%,平均渗透率为4.33mD,属于低孔特低渗储层。成岩作用有机械压实与压溶、胶结、溶蚀和交代作用。成岩阶段属于中成岩阶段A期。通过对储层岩性、物性、电性和含油性的分析,确定了有效储层下限。利用储集系数在平面的展布特征和有效储层下限将研究区储层类型分为三类,其中桥43-1块储集系数范围主要在60以上,为Ⅰ类储层,桥58块储集系数在40以上,属于Ⅱ类储层。
[Abstract]:The northeast wing of Qiaokou Oilfield is one of the potential areas for rolling expansion and increasing storage and production in the old area of Qiaokou Oilfield. The strata change greatly due to the influence of sedimentation, structure and other factors. Most of the previous studies are based on deep strata, and the reservoir characteristics of the upper 8-middle 2 sand formation in the main oil-bearing formation of shallow strata are still unclear. On the basis of digesting and absorbing the previous research achievements, this paper applies the theories and methods of reservoir sedimentology, petroleum geology, geophysical logging, etc., through core observation, thin slice identification, scanning electron microscope combined with logging, and analysis of oil test data. The reservoir characteristics of the target layer in the study area are studied deeply. The upper 8-Zhong2 sand formation in the third member of the northeast wing of Qiaokou is divided into 27 layers, of which 8 are relatively thick and stable, which are the main layers in this study. Through the comprehensive analysis of the composition maturity of heavy minerals, paleocurrent and sandstone, the source direction of the target layer is determined, mainly from NE and SW. In this paper, the sedimentary facies marks and logging facies types are summarized. Based on the source direction and the distribution characteristics of sandstone thickness in the whole area, it is clear that the sedimentary microfacies types mainly include underwater distributary channel, underwater channel flank and far bar. The underwater distributary channel sand body is the most favorable sand body in the study area. The reservoir rocks are mainly lithic feldspathic sandstone with grain size between 0.05-0.25mm and medium separation. The pores are mainly composed of intergranular pores and residual primary pores. The average porosity is 10.68 and the average permeability is 4.33mD. it belongs to low porosity and low permeability reservoir. Diagenesis includes mechanical compaction and pressure-dissolution, cementation, dissolution and metasomatism. Diagenetic stage A belongs to middle diagenetic stage. Through the analysis of reservoir lithology, physical property, electrical property and oil content, the effective lower limit of reservoir is determined. The reservoir types in the study area are divided into three categories by using the distribution characteristics of reservoir coefficients in the plane and the effective reservoir lower limit. The reservoir coefficients of Block Qiao43-1 are mainly above 60, which are class I reservoirs, and the reservoir coefficients of Block Qiao58 are above 40, which belong to class 鈪，

本文编号：1918702