莺歌海盆地乐东区深层异常高压成因机制及预测研究

doi:10.11720/wtyht.2023.1007

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Abstract

The deep strata in the Ledong area of the Yinggehai Basin have a complex pressure structure.As indicated by the surveyed pressure data,strata at different depths and horizons have greatly different pore pressure.Especially in the Huangliu Formation,the pore pressure shows a large transverse span.Moreover,it tends to reduce at the top but rises rapidly at the bottom,with a pressure coefficient of up to 2.3,indicating the presence of significant pressure mutation.Pressure prediction using only the undercompaction model yields large errors and thus is prone to induce engineering accidents.To effectively predict the formation pressure,it is necessary to determine the genetic mechanisms of overpressure.This study effectively identified the genetic mechanisms of the overpressure using the cross plots of vertical effective stress vs logging response.The identification results show that the genetic mechanisms of the deep overpressure in the Ledong area mainly include mechanical unbalanced compaction,chemical compaction,vertical pressure transmission along faults,and hydrocarbon-generating pressurization.A proper pressure prediction method was established based on the defined genetic mechanisms,thus improving the prediction precision and ensuring the smooth construction of drilling engineering.

Key words： abnormal high pressure genetic mechanism Yinggehai Basin Ledong area

Received: 24 March 2022 Published: 24 February 2023

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	Articles by authors
	Neng-Ping AI
	Peng SONG
	Wei LI
	Yun-Peng WU
	Hu LI

Cite this article:

Neng-Ping AI,Peng SONG,Wei LI, et al. Genetic mechanisms and prediction of the deep abnormal high pressure in the Ledong area,Yinggehai Basin[J]. Geophysical and Geochemical Exploration, 2023, 47(1): 190-198.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1007 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I1/190

Characteristics of measured formation pressure in Ledong area

Completion pressure chart of Well A in Ledong area

Intersection of vertical effective stress,logging sound wave and density response at measured pressure points in Ledong area
a—intersection of vertical effective stress and logging acoustic wave;b—intersection of vertical effective stress and logging density;c—intersection of logging density and acoustic wave(change with pressure coefficient);d—intersection of logging density and acoustic wave(change with depth)

Thermal evolution kinetics of organic matter and numerical simulation of hydrocarbon generation and pressurization in well LD30-1-1A,Ledong area

Formation pressure prediction map of well LD30-1-1A

Formation pressure prediction map of well LD-B

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