Identification and Distribution of Silurian Interlayers in YM 35 Well Block, Tarim Basin

doi:10.7657/XJPG20250204

Abstract

Abstract:

The distribution patterns of interlayers in the YM 35 well block of the Tarim Basin are unclear, which poses challenges for subsequent oil and gas exploration and development. To identify the interlayer types in the study area and analyze their spatial distribution characteristics, by integrating the data of cores, conventional logging, laboratory analysis, and imaging logging, the primary interlayer types in the study area were clarified. By using the three-end-member classification method, charts for identifying interlayers were established for sublayers, and identification criteria were proposed. The distribution of interlayers was analyzed laterally and vertically, and the controls of interlayers on remaining oil distribution were investigated. The results show that the study area primarily develops argillaceous interlayers and physical interlayers. Laterally, argillaceous interlayers are mainly concentrated in the lower part of the target layer, with good continuity, while physical interlayers are mainly distributed in the middle-upper part, with smaller thickness but good continuity. On plane, interlayers are mainly concentrated in the central part of the study area, forming a distinct thickness aggregation zone. The interlayer becomes thinner toward its margin as its distance from the central area increases. Controlled by the spatial distribution of interlayers, remaining oil is mainly distributed in the K3 sublayer.

Key words: Tarim Basin, YM 35 well block, argillaceous interlayer, physical interlayer, three-end-member classification method, spatial distribution, detailed evaluation, remaining oil

CLC Number:

TE122

WANG Wei, DAI Mengying, CHEN Junkai, ZOU Yunlong, WU Qiong, JIANG Qiong, FENG Cheng. Identification and Distribution of Silurian Interlayers in YM 35 Well Block, Tarim Basin[J]. Xinjiang Petroleum Geology, 2025, 46(2): 154-162.

Figures/Tables 7

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Table 1.

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地层	泥质隔夹层	物性隔夹层
地层	归一化无铀伽马	归一化电阻率	归一化中子孔隙度	归一化无铀伽马
K1小层	>0.55	>0.80	<0.10
K2小层	>0.55	>0.70	<0.18	<0.18
K3小层	>0.55	>0.80	<0.15	<0.15
K4小层	>0.40	>0.83	<0.13	<0.13