Recognition Model and Contribution Evaluation of Main Overpressure Formation Mechanisms in Sedimentary Basins

ZHANG Feng-qi，WANG Zhen-liang，ZHONG Hong-li，YANG Chao，WANG Jiang-tao

doi:10.11764/j.issn.1672-1926.2013.06.1151

Natural Gas Geoscience >

2013 , Vol. 24 >Issue 6: 1151 - 1158

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.06.1151

Recognition Model and Contribution Evaluation of Main Overpressure Formation Mechanisms in Sedimentary Basins

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1.School of Earth Science and Engineering,Xi′an Shiyou University,Xi′an 710065,China;
2.Department of Geology,Northwest University,Xi′an 710069,China;
3.College of Geology and Environment,Xi′an University of Science and Technology,Xi′an 710054,China;
4.Research Institute of Shaanxi Yanchang Petroleum Company,Xi′an 710075,China

Received date: 2013-04-17

Revised date: 2013-06-13

Online published: 2013-12-10

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Abstract

Overpressures in sedimentary basins are usually controlled by many factors,which make recognition and evaluation of each overpressure mechanism be difficult.The paper divided the causes of overpressure into four general categories: disequilibrium compaction,fluid expansion,overpressure transfer,and lateral tectonic stress.The comprehensive recognition model of these overpressure mechanism types was established.Disequilibrium compaction and lateral tectonic stress overpressures are typically associated with abnormally high porosities and overpressures generated by fluid expansion and overpressure transfer mechanisms are not associated with a porosity anomaly.Sonic velocity-vertical effective stress and sonic velocity-density plots are used to distinguish between overpressures generated by the four types.On a sonic velocity-vertical effective stress plot,sediments that have undergone disequilibrium compaction remain on the exponential function curve of normal compaction loading.However,overpressures generated by fluid expansion or overpressure transfer or lateral tectonic stress follows a sonic velocity-vertical effective stress path away from the loading curve.On a sonic velocity-density plot,sediments that have undergone disequilibrium compaction or lateral tectonic stress remain on the loading curve.However,overpressures generated by fluid expansion or overpressure transfer follow a sonic velocity-density path away from the loading curve.On the basis of the hypothesis that the decreasing magnitudes of vertical effective stress are equal to the overpressures generated by fluid expansion or overpressure transfer or lateral tectonic stress,the overpressure mechanisms are assured and the magnitudes of overpressure and the relative contribution generated by these overpressures were evaluated combined with the regional geological conditions.Although the evaluation results will underestimate the overpressure generated by these mechanisms,these can provide a good method for recognition and evaluation of overpressure in complex regions of sedimentary basins.

Key words： Formation mechanism of overpressure; Well-log response; Recognition model; Evaluation method; Sedimentary basins

Cite this article

ZHANG Feng-qi，WANG Zhen-liang，ZHONG Hong-li，YANG Chao，WANG Jiang-tao . Recognition Model and Contribution Evaluation of Main Overpressure Formation Mechanisms in Sedimentary Basins[J]. Natural Gas Geoscience, 2013 , 24(6) : 1151 -1158 . DOI: 10.11764/j.issn.1672-1926.2013.06.1151

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