Method for judging gas source of high-to-over mature natural gas
A natural gas and gas source technology, applied in the field of geology and geochemistry, can solve problems such as difficulty in effectively distinguishing oil and gas supply and contribution, inapplicability of natural gas, and limited information on genesis and accumulation
Active Publication Date: 2015-07-01
PETROCHINA CO LTD
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However, the comparative indicators of biomarkers in highly over-mature organic matter have been basically balanced or invalid, and it is difficult to effectively distinguish the supply and contribution of different source rocks to oil and gas; highly over-mature natural gas often appears as dry gas, an
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[0034] This embodiment provides a method for identifying the source of over-mature natural gas, such as figure 1 shown, including the following steps:
[0035] Select the main production layer of the gas reservoir with proven geological data as the target layer, collect natural gas samples of the target layer at the development well site with gas-collecting cylinders, and collect reservoir bitumen samples and source rocks through single well core observation Samples, parallel experiments on multiple samples;
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Abstract
The invention provides a method for judging a gas source of high-to-over mature natural gas. The method comprises the following steps: testing and analyzing geochemistry characteristics of natural gas, reservoir stratum asphalt and a hydrocarbon source rock, and establishing a natural gas-reservoir stratum asphalt-hydrocarbon source rock factor relation; and judging the gas source of the high-to-over mature natural gas. According to the method for judging the gas source of the high-to-over mature natural gas, the reservoir stratum asphalt is taken as a core entry point and the stored asphalt is used as a bond and a bridge for connecting gas and a source, so that the natural gas-reservoir stratum asphalt-hydrocarbon source rock three-end-member factor relation is established, and the comprehensive judgment of the gas source of the high-to-over mature natural gas is realized; and the situation that a corresponding available application does not exist is solved, and the actual production requirements on comparison of the gas source of the high-to-over mature natural gas, recovery of a complicated reservoir forming process, potential evaluation of high-to-over mature region resources, old marine facies seismic exploration and district selection and the like in superimposed basin deep-layer oil-gas exploration are met.
Description
technical field [0001] The invention relates to a method for identifying high-over-mature natural gas sources, and belongs to the technical field of geology-geochemistry in oil and gas exploration. Background technique [0002] Highly over-mature natural gas is an important resource type in deep marine strata in superimposed basins in my country. With the development of the oil and gas industry, the proportion of natural gas in the energy structure is increasing. However, over-mature natural gas in the deep layers of superimposed basins in my country is the main body of natural gas resources, so issues such as gas source identification, resource potential evaluation, and accumulation process recovery have received more and more attention. [0003] As we all know, most of my country's onshore oil and gas-bearing basins are superimposed basins, and two sets of combinations of deep marine strata and mid-shallow marine-continental transitional-terrestrial strata are generally d...
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IPC IPC(8): G01N33/00
Inventor 王铜山胡素云王红军李永新李秋芬李霞姜华徐兆辉
Owner PETROCHINA CO LTD
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