Method for identifying lithologic characters of oil reservoirs of carboniferous volcanic rock
A technology of lithology identification and volcanic rock, which is applied in the direction of earthwork drilling and production, wellbore/well components, etc., can solve problems such as large errors in reserve calculation and affect the overall benefits of exploration and development, and achieve the effect of improving efficiency and reducing risks
Inactive Publication Date: 2015-09-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology
[0002] my country has a vast territory, and a large number of volcanic oil and gas reservoirs are stored underground, especially in the Karamay and Jungar Basins of Xinjiang. The reserves are huge, ranging from several million tons to 100 million tons (oil and gas equivalent). However, due to the complexity of volcanic rock reservoirs, the calculation error of reserves is relatively large, which brings certain risks to reservoir development and affects the overall benefits of exploration and development. An effective Carboniferous volcanic rock reservoir lithology The identification method is also a subject that scientists have been discussing and researching
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[0015] A method for identifying lithology of Carboniferous volcanic rock reservoirs, comprising the following steps:
[0016] 1) Drilling and sampling: Drilling exploration wells, continuously obtaining debris at the bottom of the well through fracturing and flowback, sampling the debris at intervals at a certain depth, and making depth corrections according to the late arrival time of the cuttings;
[0017] 2) Preliminary data acquisition: select the mixed samples obtained each time, exclude the collapsed rock blocks, conduct geological observation, description, and naming with the naked eye or under a microscope, and calculate the mass or volume percentage of various rock debris samples respectively, and determine Rock category at sampling depth;
[0018] 3) Draw cuttings profile: Cooperate with other mud logging data to make downhole cuttings stratum profile;
[0019] 4) Establish a lithology relationship diagram: According to the data obtained from steps 1) to 3), by anal...
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The invention relates to a method for identifying lithologic characters of oil reservoirs of carboniferous volcanic rock. The method includes steps of 1), sampling drilled wells; 2), acquiring preliminary data; 3), drawing cross-section graphs of rock debris; 4), creating lithologic relational graphs; 5), classifying lithologic faces; 6), identifying the lithologic characters of the oil reservoirs. The method for identifying the lithologic characters of the oil reservoirs of the carboniferous volcanic rock has the advantages that the lithologic characters of the oil reservoirs of the carboniferous volcanic rock can be quickly and accurately identified, the accurate data can be provided, oil reservoir development risks in later periods can be reduced, and the exploration and development efficiency can be improved.
Description
technical field [0001] The invention relates to a method for identifying the lithology of Carboniferous volcanic rock reservoirs. Background technique [0002] my country has a vast territory, and a large number of volcanic oil and gas reservoirs are stored underground, especially in the Karamay and Jungar Basins of Xinjiang. The reserves are huge, ranging from several million tons to 100 million tons (oil and gas equivalent). However, due to the complexity of volcanic rock reservoirs, the calculation error of reserves is relatively large, which brings certain risks to reservoir development and affects the overall benefits of exploration and development. An effective Carboniferous volcanic rock reservoir lithology The identification method is also a subject that scientists have been discussing and studying. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a lithology identification method for Carboniferous volcanic...
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IPC IPC(8): E21B49/00
Inventor 李佳林承焰李西江
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)