Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)

Compaction is regarded as central to the reduction of reservoir physical properties. The thermal compaction process controlled by a basin’s heat flow and the static compaction caused by overload on rocks are both important factors controlling the compaction strength. However, porosity loss resulting...

Full description

Saved in:
Bibliographic Details
Main Authors: Chi Li, Jinglan Luo, Caiwei Fan, Shanshan Li, Shijiu Wu, Chuan Lei, Kunpeng Song
Format: Article
Language:English
Published: Wiley 2021-01-01
Series:Geofluids
Online Access:http://dx.doi.org/10.1155/2021/6658729
Tags: Add Tag
No Tags, Be the first to tag this record!
_version_ 1832550541318684672
author Chi Li
Jinglan Luo
Caiwei Fan
Shanshan Li
Shijiu Wu
Chuan Lei
Kunpeng Song
author_facet Chi Li
Jinglan Luo
Caiwei Fan
Shanshan Li
Shijiu Wu
Chuan Lei
Kunpeng Song
author_sort Chi Li
collection DOAJ
description Compaction is regarded as central to the reduction of reservoir physical properties. The thermal compaction process controlled by a basin’s heat flow and the static compaction caused by overload on rocks are both important factors controlling the compaction strength. However, porosity loss resulting from thermal and static compaction has not been distinguished. The Baiyun Sag in the Pearl River Mouth Basin in the northern part of the South China Sea with high heat flows and a variable geothermal gradient is an ideal setting for studying the characteristics and mechanisms of the thermal compaction process. The characteristics of compaction and the effect of thermal fluid activities on reservoir physical properties are carried out, based on the observation and identification of sandstone thin sections under a microscope, the measurement and simulation of the temperatures and trapping pressures of fluid inclusions, and the calculation of the compaction porosity loss as well. The result shows that the compaction mode of sandstone reservoirs in the Zhuhai Formation is dominated by static compaction in the LGR (the low geothermal gradient region), whereas the diagenetic process of the Zhuhai Formation in the MGR (the moderate geothermal gradient region) and HGR (the high geothermal gradient region) is affected not only by the static compaction effect but also by the thermal compaction effect caused by abnormal formation temperature and pressure conditions. The porosity loss caused by the thermal compaction ranges from 5.5% to 11.2% with an average of 7.9% and from 4.6% to 16.6% with an average of 10.2% in the MGR and HGR, respectively. The porosity loss caused by the static compaction ranges from 15.9% to 20.8% with an average of 19.4% and from 8.4% to 15.8% with an average of 12.8% in the MGR and HGR, respectively.
format Article
id doaj-art-2bdf8794842a4153a6361f623cb3111e
institution Kabale University
issn 1468-8115
1468-8123
language English
publishDate 2021-01-01
publisher Wiley
record_format Article
series Geofluids
spelling doaj-art-2bdf8794842a4153a6361f623cb3111e2025-02-03T06:06:29ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/66587296658729Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)Chi Li0Jinglan Luo1Caiwei Fan2Shanshan Li3Shijiu Wu4Chuan Lei5Kunpeng Song6State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, ChinaState Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, ChinaZhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, ChinaZhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, ChinaZhanjiang Branch of CNOOC Ltd., Zhanjiang 524057, ChinaChang’an University, Xi’an 710021, ChinaState Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, ChinaCompaction is regarded as central to the reduction of reservoir physical properties. The thermal compaction process controlled by a basin’s heat flow and the static compaction caused by overload on rocks are both important factors controlling the compaction strength. However, porosity loss resulting from thermal and static compaction has not been distinguished. The Baiyun Sag in the Pearl River Mouth Basin in the northern part of the South China Sea with high heat flows and a variable geothermal gradient is an ideal setting for studying the characteristics and mechanisms of the thermal compaction process. The characteristics of compaction and the effect of thermal fluid activities on reservoir physical properties are carried out, based on the observation and identification of sandstone thin sections under a microscope, the measurement and simulation of the temperatures and trapping pressures of fluid inclusions, and the calculation of the compaction porosity loss as well. The result shows that the compaction mode of sandstone reservoirs in the Zhuhai Formation is dominated by static compaction in the LGR (the low geothermal gradient region), whereas the diagenetic process of the Zhuhai Formation in the MGR (the moderate geothermal gradient region) and HGR (the high geothermal gradient region) is affected not only by the static compaction effect but also by the thermal compaction effect caused by abnormal formation temperature and pressure conditions. The porosity loss caused by the thermal compaction ranges from 5.5% to 11.2% with an average of 7.9% and from 4.6% to 16.6% with an average of 10.2% in the MGR and HGR, respectively. The porosity loss caused by the static compaction ranges from 15.9% to 20.8% with an average of 19.4% and from 8.4% to 15.8% with an average of 12.8% in the MGR and HGR, respectively.http://dx.doi.org/10.1155/2021/6658729
spellingShingle Chi Li
Jinglan Luo
Caiwei Fan
Shanshan Li
Shijiu Wu
Chuan Lei
Kunpeng Song
Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)
Geofluids
title Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)
title_full Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)
title_fullStr Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)
title_full_unstemmed Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)
title_short Impact of High Thermal Setting and Fluid Activities on Sandstone Compaction: A Case Study of the Baiyun Sag in the Pearl River Mouth Basin (Northern South China Sea)
title_sort impact of high thermal setting and fluid activities on sandstone compaction a case study of the baiyun sag in the pearl river mouth basin northern south china sea
url http://dx.doi.org/10.1155/2021/6658729
work_keys_str_mv AT chili impactofhighthermalsettingandfluidactivitiesonsandstonecompactionacasestudyofthebaiyunsaginthepearlrivermouthbasinnorthernsouthchinasea
AT jinglanluo impactofhighthermalsettingandfluidactivitiesonsandstonecompactionacasestudyofthebaiyunsaginthepearlrivermouthbasinnorthernsouthchinasea
AT caiweifan impactofhighthermalsettingandfluidactivitiesonsandstonecompactionacasestudyofthebaiyunsaginthepearlrivermouthbasinnorthernsouthchinasea
AT shanshanli impactofhighthermalsettingandfluidactivitiesonsandstonecompactionacasestudyofthebaiyunsaginthepearlrivermouthbasinnorthernsouthchinasea
AT shijiuwu impactofhighthermalsettingandfluidactivitiesonsandstonecompactionacasestudyofthebaiyunsaginthepearlrivermouthbasinnorthernsouthchinasea
AT chuanlei impactofhighthermalsettingandfluidactivitiesonsandstonecompactionacasestudyofthebaiyunsaginthepearlrivermouthbasinnorthernsouthchinasea
AT kunpengsong impactofhighthermalsettingandfluidactivitiesonsandstonecompactionacasestudyofthebaiyunsaginthepearlrivermouthbasinnorthernsouthchinasea