西南石油大学学报(自然科学版) ›› 2006, Vol. 28 ›› Issue (6): 16-19.DOI: 10.3863/j.issn.1000-2634.2006.06.005

• 地质勘探 • Previous Articles     Next Articles

RESEARCH ON THE COMPACTION LAW OF THE WEST SICHUAN DEPRESSION

LI Yang-bing MOU Zhong-hai XIE Yong-liang HE Hui   

  1. Southwest Petroleum University, Chengdu Sichuan 610500,China
  • Received:2006-01-05 Revised:1900-01-01 Online:2006-12-20 Published:2006-12-20
  • Contact: LI Yang-bing

Abstract: On the basis of the acoustic well logging data from west Sichuan depression, the compaction curves of the sandstone and mudstone are depicted, and the relation between pressure coefficient and formation location in some wells are collected by the comprehensive analyses of these data, compaction law of the west Sichuan depression is summarized . It is revealed that there are four stages of compaction vertically, which are the fast compaction stage, the normal compaction stage, the transition compaction stage and the undercompaction stage. There is a trend gradually deepening to the up boundary of each compacted layer from north to south. The sand and mudstone of upper Triassic (T3) have the similar phenomenon of abnormal pressure. The distributing characteristic of oil and gas is different in different compaction stage. but natural gas mainly exists in the transition stage and the undercompaction stage.

Key words: compaction, law, pressure coefficient, oil and gas distribution, West Sichuan Depression

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