河控三角洲水下分流河道砂体储集层构型精细分析

石油勘探与开发

2013年4月PETROLEUM EXPLORATION AND DEVELOPMENT Vol.40 No.2 181 文章编号：1000-0747(2013)02-0181-07 DOI: 10.11698/PED.2013.02.06

河控三角洲水下分流河道砂体储集层构型精细分析

——以扶余油田探51区块为例

赵小庆1, 2，鲍志东1, 2，刘宗飞1，赵华1, 2，柴秋会1, 2

（1. 中国石油大学（北京）地球科学学院；2. 中国石油大学（北京）油气资源与探测国家重点实验室）

基金项目：国家科技重大专项（2008ZX05030-005-01；2011ZX05004-004-007）

摘要：基于“模式拟合、动态验证”的研究思路，结合密井网区10口取心井、257口井测井资料及近10年的生产动态资料，对松辽盆地扶余油田探51区块泉四段扶余油层三角洲前缘水下分流河道储集层进行分析，探究水下分流河道储集层内部构型单元的空间展布特征及识别标志。结果表明：研究区目的层单河道砂体宽度为300～500 m，其识别标志分别为：河道间沉积、邻井砂体高程差异、河道砂体厚度差异、相邻砂体的“厚—薄—厚”组合；单河道砂体内部4级构型界面的倾角为0°～2°。明确了水下分流河道储集层中单河道砂体及单河道砂体内部增生体的测井响应特征及识别方法，建立了研究区目的层水下分流河道砂体的三维构型模型，为全区水下分流河道砂体解剖提供了定量、可靠的地质模式。图11表1参25

关键词：河控三角洲；扶余油田；储集层构型；水下分流河道砂体；隔层；夹层

中图分类号：TE122.1 文献标识码：A

An in-depth analysis of reservoir architecture of underwater distributary channel sand bodies in a river dominated delta: A case study of T51 Block, Fuyu Oilfield Zhao Xiaoqing1,2, Bao Zhidong1,2, Liu Zongfei1, Zhao Hua1,2, Chai Qiuhui1,2

(1. College of Geosciences, China University of Petroleum, Beijing 102249, China; 2. State Key Laboratory of Petroleum

Resource and Prospecting, China University of Petroleum, Beijing 102249, China) Abstract:Guided by the concept of “model fitting, dynamic validation”, and based on the data of 10 coring wells, 257 logging wells, and the production performance in the dense spacing area during the past ten years, the underwater distributary channel sand reservoir in K1q4 of T51 Block, Fuyu Oilfield, Songliao Basin, was analyzed to examine the spatial distribution and identification marks of the architectures within the reservoir. Results indicated that the single channel sand body is 300–500 m wide and can be identified by such marks as inter-channel sediments, sand elevation difference between wells, difference of channel sand thickness, and “thick-thin-thick”

sands association; the dip angle of the fourth-order interface is 0°–2°. Besides, the logging response characteristics and identification method of single channel sand bodies and their interior accreted bodies were defined for the reservoir. A 3D architecture model is established for the underwater distributary channel reservoir in the study area, providing a quantitative and reliable geological model for analysis of underwater distributary channel sands in the whole area.

Key words:river dominated delta; Fuyu Oilfield; reservoir architecture; underwater distributary channel sand; barrier; interlayer

0 引言

储集层构型亦称为储集层建筑结构，是指不同级次储集层构成单元的形态、规模、方向及其叠置关系[1]。三角洲前缘沉积是中国已发现油田的重要储集层类型之一[2]，而水下分流河道砂体是河控三角洲前缘储集砂体的重要组成部分，研究水下分流河道砂体的构型可以有效指导剩余油挖潜，对油田开发具有重要意义。

水下分流河道砂体的储集层构型研究起步较晚，前人研究主要集中在野外露头和现代沉积[3]，对地下储集层构型的研究则较少[4-6]。本文以扶余油田探51区块扶余油层河控三角洲水下分流河道砂体储集层为例，探讨水下分流河道砂体各级次构型单元的识别标志及解剖方法，并建立研究区水下分流河道砂体储集层三维构型模型。

1 研究区概况

扶余油田位于松辽盆地中央坳陷区东缘扶新隆起带扶余Ⅲ号构造（见图1），是一个被断层复杂化的多高点穹隆背斜。油藏类型为被断层复杂化的层状构造