辫状河储集层隔夹层成因及其对剩余油的影响——以大港油田刘官庄地区馆陶组三段Ⅱ砂组为例

doi:10.7657/XJPG20240113

摘要/Abstract

摘要：

为明确辫状河储集层隔夹层对剩余油分布的控制作用，以大港油田刘官庄地区馆陶组三段Ⅱ砂组为例，利用岩心、测井、录井、开发生产等资料，建立了研究区目的层段隔夹层定量识别标准，确定了隔夹层层次结构、成因及对剩余油分布的影响。研究区隔夹层可划分为砂组间隔层、单砂体间夹层和单砂体内夹层，分别发育在7级、8级和9级砂体构型界面附近。砂组间隔层与泛滥平原泥岩和粉砂质泥岩有关，厚度多为几十厘米至数米，对油气的垂向分隔作用强，开发过程中边水沿着地层优先推进，导致边部水淹严重，剩余油多分布在远离注水井的复合心滩坝及辫状河道的上部。单砂体间夹层与废弃河道和冲沟中的细粒沉积有关，厚度一般为0~2 m，局部阻碍流体垂向运移，侧向上控制着不同砂体间的剩余油分布，主要形成废弃河道控制型和冲沟控制型2种剩余油分布模式。单砂体内夹层主要与侧积泥岩、落淤层和河道间泥质沉积有关，层内夹层厚度可达几十厘米，可形成侧积泥岩控制型、落淤层控制型及河道间泥岩控制型3种剩余油分布模式。

关键词: 大港油田, 刘官庄地区, 馆陶组, 隔夹层, 泛滥平原, 落淤层, 废弃河道, 剩余油分布

Abstract:

In order to clarify the controls of barriers/interlayers on the distribution of remaining oil in the braided-river reservoirs，taking the sand set Ⅱ in the third member of the Guantao formation （N₁g^Ⅱ₃） in the Liuguanzhuang area of Dagang oilfield as an example，and using the data of core，testing，logging，and production performance，the criteria for quantitative identification of barriers/interlayers were established for the target interval in the study area，and the hierarchy，genesis of barriers/interlayers and their controls on remaining oil distribution were determined. In the study area，the barriers/interlayers in the target interval can be divided into 3 categories such as barriers between sand sets，interlayers between sand bodies，and interlayers within a sand body，which are developed near the architecture boundaries of the 7th-，8th-，and 9th-order sand bodies，respectively. The barriers between sand sets are dominated by floodplain mudstones and silty mudstone，with the thickness ranging from tens of centimeters to several meters. They can efficiently seal oil and gas vertically and allow the edge water to advance preferentially along the formation during development，leading to severe water flooding，and thus the remaining oil is mostly distributed in the upper parts of the complex mid-channel bars and braided channels far from water injection wells. The interlayers between sand bodies are mainly composed of fine-grained sediments in abandoned channels and gullies，with the thickness typically ranging from 0 to 2 meters. They locally hinder vertical fluid migration and laterally control the distribution of remaining oil in different sand bodies，leading to two remaining oil distribution patterns：one is controlled by abandoned channel and the other by gully. The interlayers within a sand body are primarily associated with lateral accreted and interchannel mud deposits，and fall-silt seam，with the thickness reaching tens of centimeters，leading to three remaining oil distribution patterns，which are controlled by laterally-accreted mudstone，fall-silt seam，and interchannel mudstone，respectively.

Key words: Dagang oilfield, Liuguanzhuang area, Guantao formation, barrier and interlayer, floodplain, fall-silt seam, abandoned channel, remaining oil distribution

中图分类号:

TE112.24

李航, 李胜利, 周练武, 马水平, 黄晓娣, 韩波, 李宁. 辫状河储集层隔夹层成因及其对剩余油的影响——以大港油田刘官庄地区馆陶组三段Ⅱ砂组为例[J]. 新疆石油地质, 2024, 45(1): 94-101.

LI Hang, LI Shengli, ZHOU Lianwu, MA Shuiping, HUANG Xiaodi, HAN Bo, LI Ning. Genesis of Barriers/Interlayers in Braided-River Reservoirs and Its Controls on Remaining Oil Distribution：A Case of N₁g^Ⅱ₃ in Liuguanzhuang Area of Dagang Oilfield[J]. Xinjiang Petroleum Geology, 2024, 45(1): 94-101.

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隔夹层层次	研究区构型分级方案		Miall 构型分级方案		时间规模/年
隔夹层层次	辫状河相构型单元	构型界面级别	辫状河相构型单元	构型界面级别	时间规模/年
砂组间隔层	（单一）辫流带/复合心滩坝	7级	辫流带	5级	10³~10⁴
单砂体间夹层	（单一）心滩坝/辫状河道/ 废弃河道	8级	心滩坝或河道	4级	10²~10³
单砂体内夹层	增生体/落淤层/河道滞留/河道间泥岩/河道充填砂岩/侧积泥岩/冲沟/砂塞/泥塞	9级	增生体	3级	10¹~10²