松辽盆地长垣地区白垩系青山口组一段有机质含量对超压分析的影响及校正方法

doi:10.11743/ogg20190421

Abstract

Abstract: The organic-rich shale is composed of three parts:non-organic mudstone system, solid organic matter and pore fluid.Given that the empirical analysis of source rock overpressure by logging parameters tends to be influenced by orga-nic matter, we proposed a set of logging parameter correction methods based on the content of organic matter for the identification of source rock overpressure origin.A case study of the shale in the first member of Qingshankou Formation (K₁qn₁) in Well Pu532 in Placanticline area, Songliao Basin shows that the knowledge of overpressure caused by disequilibrium compaction has been proven wrong by both porosity comparison and velocity-density cross plot under the effect of organic-matter correction.Furthermore, when measuring the pressure of a research target with its predicted buried depth less than the largest buried depth in history, it is necessary to correct the normal compaction trend by the difference between the maximum palaeoburied depth and the current one.Subsequently the prediction precision of typical wells' pressure will be better than 95% in line with corrected logging parameters.

Key words: pressure prediction, overpressure, organic matter correction, maximum buried depth, normal compaction curve, shale, K₁qn₁, Songliao Basin

CLC Number:

TE122.1

Xu Zeyang, Zhao Jingzhou, Li Jun. The impact of organic matter content on overpressure analysis and its correction method in the first member of Cretaceous Qingshankou Formation, Placanticline area, Songliao Basin[J]. Oil & Gas Geology, 2019, 40(4): 938-946.

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The impact of organic matter content on overpressure analysis and its correction method in the first member of Cretaceous Qingshankou Formation, Placanticline area, Songliao Basin

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