Method for improving accuracy of quantitative evaluation of maturity of hydrocarbon source rock by aromatics parameter
A quantitative evaluation and source rock technology, applied in the field of petroleum geological exploration, can solve the problems of large errors in the quantitative evaluation of maturity, and achieve the effect of strong operability and improved accuracy
Active Publication Date: 2019-11-19
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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[0003] When using aromatic hydrocarbon parameters to quantitatively evaluate the maturity of source rocks in related areas, it was found that the single aromatic hydrocarbon maturity parameter R c The formula, often has a large error when carrying out the quantitative evaluation of maturity
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Embodiment 1
[0038] A method for improving the accuracy of quantitative evaluation of source rock maturity by aromatic parameters, comprising the following steps:
[0039] (1) Taking the Mesozoic in the Hari Sag of Yingen-Ejina Banner Basin as the target area, the Mesozoic in this sag is the comprehensive development period of faulted lake basins, mainly developing lacustrine sedimentary systems; the Mesozoic sedimentary strata can be divided into Baying Gobi from bottom to top Group one section (K 1 b 1 ), the second section of Bayingobi group (K 1 b 2 ), the third section of Bayingobi group (K 1 b 3 ), Su Hongtu Group (K 1 s), silver root group (K 1 y) and Ulan Suhai Formation (K 2 w); the source rocks are relatively developed, and the source rock lithology mainly includes dark gray-black mudstone, gray-dark gray mudstone, gray lime mudstone, dark gray dolomitic mudstone, tuffaceous mudstone, argillaceous dolomite, etc.;
[0040] The source rock samples come from Wells H1~H6 in t...
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The invention discloses a method for improving accuracy of quantitative evaluation of maturity of hydrocarbon source rock by an aromatics parameter. The method includes the following steps: (1) selecting a target area and selecting a representative hydrocarbon source rock sample; (2) performing determination of kerogen vitrinite reflectance (Ro) on the hydrocarbon source rock sample; (3) performing chromatography-mass spectrometry on aromatic fraction of an asphalt extract of the hydrocarbon source rock sample; (4) calculating an aromatic maturity parameter of the hydrocarbon source rock sample; (5) performing linear-regression analysis on a single aromatic maturity parameter and the Ro, and in three major aromatic maturity parameters, separately finding one parameter with a maximum linearcorrelation coefficient of the Ro; (6) performing a multiple linear regression analysis on the 3 parameters determined in the step (5) and the Ro, and fitting out a multivariate relational expressionof vitrinite reflectance equivalent to the Ro; and (7) effectively evaluating the multivariate relational expression determined in the step (6). The method enables the accuracy of the quantitative evaluation of the maturity of the hydrocarbon source rock by the aromatics parameter to be improved.
Description
technical field [0001] The invention belongs to the technical field of petroleum geological exploration, and in particular relates to a method for improving the accuracy of aromatic hydrocarbon parameters quantitatively evaluating the maturity of source rocks. Background technique [0002] Compared with biomarkers of sterane and terpane saturated hydrocarbons, polycyclic aromatic hydrocarbons have the characteristics of strong resistance to biodegradation, high thermal stability, and high content, and have a wider application range and superiority in maturity evaluation. The theoretical basis for the establishment of aromatic hydrocarbon maturity parameters is that during the thermal evolution of organic matter, the methylation, methyl rearrangement, and demethylation of aromatic compounds are all controlled by thermal stability. The relative content of compounds with poor thermal stability will gradually decrease when they transform into compounds with better thermal stabil...
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IPC IPC(8): G01N30/02G01N21/55
CPCG01N21/55G01N30/02
Inventor 陈治军贺永红马芳侠高怡文刘护创陈义国王小多韩长春
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP