Diagenetic characteristics under abnormally low pressure: A case from the Paleocene of southern Western Sag of Liaohe Depression, Bohai Bay Basin

MENG Yuanlin; ZHANG Lei; QU Guohui; ZHANG Fenglian; MENG Fanjin; LI Chen; JIAO Jinhe; SHI Lidong

doi:10.11698/PED.2016.04.22

2016 , Vol. 43 >Issue 4: 669 - 674

DOI: https://doi.org/10.11698/PED.2016.04.22

Orignal Article

Diagenetic characteristics under abnormally low pressure: A case from the Paleocene of southern Western Sag of Liaohe Depression, Bohai Bay Basin

MENG Yuanlin ,
ZHANG Lei ,
QU Guohui ,
ZHANG Fenglian ,
MENG Fanjin ,
LI Chen ,
JIAO Jinhe ,
SHI Lidong

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1. Northeast Petroleum University, Daqing 163318, China;
2. Exploration and Development Institute of PetroChina Liaohe Oil Field Company, Panjin 124010, China;
3. Resolution Energy Services LLC, Houston TX, 77204-2024, USA;
4. Daqing Oil Field Company Ltd., PetroChina, Daqing 163517, China

Online published: 2016-11-02

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Abstract

The effect of low pressure and abnormally low pressure on reservoir diagenesis and physical property of the Paleocene in southern part of Western Sag of Liaohe Depression, Bohai Bay Basin have been analyzed using large amounts of pressure, physical property and formation testing data. When formation pressure is low or abnormally low, the pore fluid has lower pressure, the overburden litho-static pressure is largely born by the sandstone framework, sometimes over compaction occurs, leading to densification of reservoir and stronger mechanical compaction; residual formation pressure has a negative correlation with carbonate cement content, low pressure or abnormally low pressure tight sandstone formations have higher carbonate cement content than sandstone formations with hydrostatic pressure or weak overpressure; pore fluid in sandstones with low pressure or abnormally low pressure has higher Si⁴⁺, conducive to the siliceous cementation; when dissolution happens, reservoirs with low pressure or abnormally low pressure, poor in original physical properties, are not favorable for the injection of dissolution fluid and the expulsion of dissolution products, so they have weaker dissolution. In summary, reservoirs with low pressure or abnormally low pressure have poorer physical properties.

Key words： abnormally low pressure; diagenesis; reservoir physical property; tight sandstone; Western Sag; Liaohe Depression

Cite this article

MENG Yuanlin , ZHANG Lei , QU Guohui , ZHANG Fenglian , MENG Fanjin , LI Chen , JIAO Jinhe , SHI Lidong . Diagenetic characteristics under abnormally low pressure: A case from the Paleocene of southern Western Sag of Liaohe Depression, Bohai Bay Basin[J]. Petroleum Exploration and Development, 2016 , 43(4) : 669 -674 . DOI: 10.11698/PED.2016.04.22

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