川中侏罗系大安寨致密灰岩储层特征及测井评价

发布时间：2018-03-06 01:08

  本文选题：大安寨段　切入点：介壳灰岩　出处：《西南石油大学》2017年硕士论文　论文类型：学位论文

【摘要】：川中地区侏罗系大安寨段主要为致密灰岩储层,受到来自压实、重结晶、胶结等成岩作用对储层物性的破坏性影响,该储层呈现出低孔、低渗、孔喉结构多样及非均质性强等特点,造成大安寨段储层结构复杂,储层内部孔缝的类型、特征多变,不利于致密油气的勘探开发。因此川中地区产量要实现稳产增产,开展致密灰岩储层特征及测井评价具有很强的实际意义。论文以川中地区侏罗系大安寨段为研究层段,通过岩心、普通薄片、铸体薄片、岩化实验等资料,分析致密灰岩储层储集空间特征及类型,基于高压压汞分析致密灰岩储层的孔喉结构,并利用常规测井资料建立适用于侏罗系大安寨段储层的物性及饱和度模型。此外,在储集空间、孔喉结构、裂缝特征的评价上,运用经验统计法、孔隙结构分类法及产能约束法综合确定储层的物性下限,进而分析致密灰岩储层类型及测井相特征。研究表明:(1)该地区主要岩性为介壳灰岩,其中生物碎屑含量较高,主要为介形虫、瓣鳃类、腹足类等湖相生物,在介壳灰岩中常发育壳内溶蚀孔和壳间缝。(2)储层的储集空间可按照其孔隙大小划分为三种类型,以微孔发育较多。孔喉结构以Ⅱ型为主,具有排驱压力较高、中值压力高、孔喉半径小、喉道分选差的特征。裂缝以中等-微裂缝为主。利用常规测井建立储层特征的电性划分标准,其中微孔及微裂缝在电阻率曲线上响应明显,区分效果好。(3)川中侏罗系大安寨段储层孔隙度、渗透率的主要范围分别为0.5%～1.5%和0.001÷10-3～1×1013μm2。其中储层内介壳灰岩的物性较好,含泥介壳灰岩的物性较差。并利用岩心孔渗数据及岩电参数,建立储层物性及饱和度参数的计算模型,取得了较好的效果,可更为有效的分析储层类型。(4)大安寨致密灰岩储层可分为四类,其中Ⅰ类储层的物性最好,多发育在大一段。通过对常规测井相特征的分析,当测井相为箱型时,多发育Ⅰ、Ⅱ类储层;测井相表现为钟型,多发育Ⅱ类、Ⅳ类储层;当测井相表现为漏斗-指型、明显齿型时,一般为Ⅲ类储层。(5)通过储层类型划分标准,应用于中台山地区时,其大一段的SH2-SH6-SH1-SH4井一带、大一三段的SH2-SH6-N16-N1 井一带、大三段的 ZHT1-SH2-SH4 井一带及 N14-N13-N9-N6 井一带储层发育最好,属于Ⅰ类储层,可成为勘探开发的重点地区。本论文为川中侏罗系大安寨致密灰岩储层的储层特征、储层参数计算、储层类型、储层测井相特征提供了一套研究方法,为研究区勘探开发提供了更加可靠的测井解释依据。
[Abstract]:The Jurassic Da'anzhai formation in central Sichuan is mainly composed of dense limestone reservoir, which is affected by diagenesis, such as compaction, recrystallization and cementation, on the physical properties of the reservoir. The reservoir shows low porosity and low permeability. The diversity and heterogeneity of pore and throat structure make the reservoir structure of Da'anzhai section complex, the types and characteristics of internal pore fractures changeable, which is not conducive to the exploration and development of tight oil and gas. It is of great practical significance to develop tight limestone reservoir characteristics and log evaluation. This paper takes the Jurassic Da'anzhai formation in the central Sichuan area as the study layer, and through the data of core, ordinary thin slice, cast thin slice, lithology experiment, etc. The characteristics and types of reservoir space of dense limestone reservoir are analyzed. The pore throat structure of dense limestone reservoir is analyzed based on high pressure mercury pressure. The physical properties and saturation model suitable for Jurassic Da'anzhai formation reservoir is established by using conventional logging data. In the evaluation of reservoir space, pore throat structure and fracture characteristics, the lower limit of reservoir physical properties is determined synthetically by means of empirical statistics, pore structure classification and productivity constraint method. The study shows that the main lithology in this area is meso-shell limestone, in which the bioclastic content is relatively high, such as ostracia, lamellodes, gastropods and other lacustrine organisms. The reservoir space can be divided into three types according to the pore size of the reservoir. The pore throat structure is mainly type 鈪，

本文编号：1572662