A Method for Restoring Structure-Fluid Pressure of Deep Carbonate Rock
A carbonate rock and fluid pressure technology, applied in earthwork drilling, wellbore/well components, design optimization/simulation, etc., can solve problems such as low accuracy of fluid information and temperature that cannot truly reflect the capture temperature
Active Publication Date: 2022-02-08
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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However, as the formation goes from deep (burial depth > 4500m) to ultra-deep (burial depth > 6000m), fluid inclusions are prone to leakage or rebalancing, and the measured temperature cannot truly reflect the capture temperature, which leads to the accuracy of the obtained fluid information. lower
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[0033] Taking the middle and lower Ordovician Yingshan Formation reservoirs in Tazhong Oilfield, Tarim Basin as an example, the specific implementation method of the present invention will be further described in detail in conjunction with the accompanying drawings.
[0034] In the process of technology implementation, the instrument model used for cluster isotope analysis is MAT-253 mass spectrometer, the instrument used for fluid inclusion salinity test and analysis is Linkam Cooling Systems, and the hot and cold table (model THMS600) is produced by German Zeiss company Axioskop40 type polarizing / fluorescence microscope is used for microthermometry system.
[0035] See attached Figure 4 , Figure 4 A method for restoring deep carbonate formation-fluid pressure provided by the present invention, such as Figure 4 As shown, the method includes:
[0036] Step 1: Rock and Mine Observation
[0037] Observe the intersecting relationship of fractures under the core and polariz...
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The present invention provides a method for recovering the structure-fluid pressure of deep carbonate rocks. The method includes: firstly determining the relative time and diagenetic sequence of the formation of different fracture-filled veins through detailed structural analysis; The cluster isotope value (Δ 47 ) to obtain the temperature at the time of vein formation and the oxygen isotope value of the fluid (δ 18 o w ); analyze fluid inclusions to obtain fluid salinity and hydrocarbon charging; establish isovolume lines based on fluid inclusion salinity; combine the temperature of cluster isotope analysis with fluid inclusion isovolume lines to define the time when veins are formed Fluid absolute pressure, which can be applied to research such as basin simulation. The present invention mainly obtains fluid pressure information through the combination of fluid inclusions and cluster isotope analysis, and has important guiding significance for studying the genetic mechanism of deep marine carbonate reservoirs.
Description
technical field [0001] The invention relates to the technical field of petroleum geological exploration and development, in particular to a method for recovering structure-fluid pressure by combining cluster isotopes and fluid inclusions. Background technique [0002] In sedimentary basins, tectonic-fluid activities always run through diagenetic transformation processes including cementation, dissolution, recrystallization and dolomitization, which have an important impact on the quality of reservoirs. very important. However, for deep oil and gas reservoirs, due to the superimposition and reformation of multi-stage burial-tectonic effects in the later stage, the fluid activities are complex and changeable, so the reconstruction and prediction of basin structure-fluid activities are very challenging. Deep-ultra-deep reservoirs are the key fields of national oil and gas exploration. In recent years, multiple sets of large-scale marine carbonate rocks have been discovered in ...
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IPC IPC(8): E21B49/00G06F30/20
CPCE21B49/00G06F30/20
Inventor 刘嘉庆李忠宋一帆梁裳恣
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI