Genesis of Barriers/Interlayers in Braided-River Reservoirs and Its Controls on Remaining Oil Distribution：A Case of N1gⅡ3 in Liuguanzhuang Area of Dagang Oilfield

doi:10.7657/XJPG20240113

Abstract

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

CLC Number:

TE112.24

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.

Figures/Tables 8

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Table 1.

Table 2.

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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

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

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