松辽盆地大安地区扶余油层致密砂岩油 分布特征及控制因素

石油勘探与开发

2015年10月PETROLEUM EXPLORATION AND DEVELOPMENT Vol.42 No.5 589 文章编号：1000-0747(2015)05-0589-09 DOI: 10.11698/PED.2015.05.05

松辽盆地大安地区扶余油层致密砂岩油

分布特征及控制因素

孙雨1, 2，邓明2，马世忠2，陈玉明3，于利民3，张雁2，闫百泉1, 2，张云峰2

（1. 西南石油大学油气藏地质及开发工程国家重点实验室；2. 东北石油大学油气藏形成机理与

资源评价黑龙江省重点实验室；3. 中国石油吉林油田公司勘探开发研究院）

基金项目：西南石油大学油气藏地质及开发工程国家重点实验室资助项目（PLN1305）；国家高新技术研究发展计划（863）项目（2013AA064903）；国家自然科学基金（41202102）；中国博士后科学基金（2014M551212）

摘要：综合利用岩心、岩石薄片、恒速压汞测试及扫描电镜等资料，对松辽盆地大安地区扶余油层致密砂岩油的储集层特征、含油特征及其主控因素进行了研究。大安地区扶余油层含油特征表现为：①大面积（准）连续分布，局部“甜点”富集；②含油丰度低，致密油分布极其复杂；③含油级别以油浸—油斑为主，含油物性下限极低；④油水分异差，无统一油水界面。以上含油特征主要受控于研究区分流河道砂体的空间分布、储集层物性差异、孔喉结构及大小。分流河道砂体分布的边界即为致密砂岩油分布的外边界，致密砂岩油分布的非均质性受控于单期分流河道砂体及多期（或多支）分流河道砂体间的接触关系；物性差异控制了“甜点”的分布，进而控制了致密砂岩油的富集；孔喉结构及其大小控制致密砂岩油的油水分异程度，纳米级喉道系统控制了石油滞留成藏。图16表1参13 关键词：致密砂岩油；储集层特征；致密油分布；含油性；扶余油层；松辽盆地

中图分类号：TE122.2 文献标识码：A

Distribution and controlling factors of tight sandstone oil in Fuyu

oil layers of Da’an area, Songliao Basin, NE China Sun Yu1, 2, Deng Ming2, Ma Shizhong2, Chen Yuming3, Yu Limin3, Zhang Yan2, Yan Baiquan1,2, Zhang Yunfeng2

(1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University), Chengdu 610500,

China; 2. Heilongjiang Oil and Gas Reservoir Forming Mechanism and Resource Evaluation Key Laboratory (Northeast Petroleum University), Daqing 163318, China; 3. Exploration and Development Research

Institute, PetroChina Jilin Oilfield Company, Songyuan 138000, China)

Abstract:By using core samples, thin section, scanning electron microscope and rate-controlled mercury penetration data etc, the reservoir characteristics, oil-bearing characteristics and main controlling factors of the tight sandstone oil in Fuyu oil layer of Da’an area, Songliao Basin are studied. The oil-bearing characteristics of Fuyu oil layers in Da’an area are as follows: (1) the extensive and continuous distribution, with “sweet spots” in local areas; (2) low oil abundance, and very complex distribution; (3) oil-bearing grade being oil immersion to oil spot, with very low lower-limit of oil-bearing porosity and permeability; and (4) poor differentiation of oil and water, no uniform oil-water contact. The above oil-bearing characteristics of the tight sandstone in Fuyu oil layers are mainly controlled by the spatial distribution of distributary channel sands, the differences in reservoir physical properties, the structure and size of pores and throats. The boundary of distributary channel sandbody is the boundary of tight sandstone oil distribution. The heterogeneity of tight sandstone oil is controlled by the single distributary channel sandbody and the contact relationship between different stages of distributary channel sandbody. Distribution of “sweet spots” and enrichment of tight sandstone oil are controlled by the differences in physical properties. The differentiation of oil and water in the tight sandstone is controlled by the pore structure and pore size. In-situ oil accumulation is controlled by the nano-pore throat structure system.

Key words:tight sandstone oil; reservoir characteristics; tight oil distribution; oil-bearing characteristics; Fuyu oil layer; Songliao Basin

0 引言

致密砂岩储集层主要是指覆压基质渗透率小于0.2×10−3μm2的砂岩储集层[1]，该类储集层中的含油气饱和度一般小于60%，无自然工业产能，但在一定技术措施下可获得工业油气产能[2]。鄂尔多斯盆地三叠系延长组、四川盆地三叠系须家河组、松辽盆地白垩系泉头组—登娄库组、吐哈盆地侏罗系水西沟群、准噶尔盆地侏罗系八道湾组、塔里木盆地库车东部侏罗系及西部深层白垩系巴什基奇克组致密砂岩均具备油气成藏的地质条件[3-7]。从目前已发表的文献看，致密砂岩储集层中的油气呈现“连续型”油气聚集特征[8-9]，

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