准噶尔盆地腹部侏罗系超压特征和测井响应以及成因

何生; 何治亮; 杨智; 武恒志; 王芙蓉; 石万忠

Volume 34 Issue 3

May 2009

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Article Navigation > Earth Science > 2009 > 34(3): 457-470

HE Sheng, HE Zhi-liang, YANG Zhi, WU Heng-zhi, WANG Fu-rong, SHI Wan-zhong, 2009. Characteristics, Well-Log Responses and Mechanisms of Overpressures within the Jurassic Formation in the Central Part of Junggar Basin. Earth Science, 34(3): 457-470.

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Characteristics, Well-Log Responses and Mechanisms of Overpressures within the Jurassic Formation in the Central Part of Junggar Basin

1.
Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education, China University of Geosciences, Wuhan 430074, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
3.
Research Institute of Petroleum Exploration and Production, SINOPEC, Beijing 100083, China
4.
Southwest Branch Company, SINOPEC, Chengdu 610051, China

Received Date: 2008-10-21
Publish Date: 2009-05-25

Abstract

Abstract

The deep overpressured system occurs in the Jurassic Formation of the central area of Junggar basin.This has been confirmed by drill stem tests (DSTs) and modular dynamic formation tests (MDTs) with 67 measured formation pressures from 26 wells which reveal excessive pressures ranging from 11 MPa to 57 MPa with the pressure coefficients of 1.24 to 2.07 at depths between 4 470 m and 6 160 m.The measured overpressured values are mostly in the sandstone layers of Jurassic formation, only a few in the bottom of the Cretaceous formation and one in the Lower Triassic formation.The measured values of porosity and permeability of the overpressured sandstone samples range from 3.20% to 16.00% and 0.02×10^-3 μm² to 14.40×10^-3 μm² respectively.This fluid overpressured zone over depths of 4 430-6 650 m is coincident with marked increase of the density of drilling mud, as well as the response of overpressured shales and sandstones to high sonic transit times and low resistivity values relative to their normal trends.The observed data suggest that the burial depth of the top of magnitude overpressured zone may not be smaller than 4 400 m with a formation temperature of about 104 ℃, and the tops in some drilling wells are to reach as deep as about 6 000 m with a formation temperature of about 140 ℃, and the depth of the top of the deep overpressured zone changes with the burial depth of the Jurassic formation.The values of vitrinite reflectance (R_o, %) in the deep overpressured zone of Jurassic formation range from about 0.7% to 1.3%, which suggests that the variations of depth distribution of the overpressured zone are controlled by the burial depth of mature source-rocks of the Jurassic formation.This study indicates that the main origin of abnormally high pressures in the full-compacted Jurassic formation is generation-related oil and gas of the kerogen from the coal-bearing source-rocks.The physical simulation experiments show that the effective stress of rock framework reduces due to high pore fluid pressure, which can directly lead to the decrease of velocity of acoustic wave through the shale and sandstone rocks.As a result, the higher interval transit times respond to overpressuring rather than higher porosities anomaly due to compaction disequilibrium.Under the temperature of the overpressured formations, the ionization constant of high-pressure liquid water (near-critical water) may be increased, which is likely to decrease formation resistivity.Further study on this phenomenon is expected to offer a reasonable explanation for the cause of low formation resistivity in the observed overpressured zone.

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Characteristics, Well-Log Responses and Mechanisms of Overpressures within the Jurassic Formation in the Central Part of Junggar Basin

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