A method for isochronous division of fluvial facies strata based on elevation difference
An elevation difference and isochronous technology, applied in the field of oil and gas field development, to achieve the effect of objective unit division results and reduce multi-solution
Active Publication Date: 2018-11-27
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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However, in the actual operation process, the selection of the isochronous stratigraphic boundary in the medium-term cycle has certain uncertainties due to human subjective factors, resulting in ambiguity in the final isochronous stratigraphic division scheme
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[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0032] The present invention proposes a method for isochronous division of fluvial facies strata based on elevation difference, comprising the following steps:
[0033] 1) Select the isochronous reference interface, the specific process is as follows:
[0034] The interface between the regional flood mudstone and the overlying sandstone at the end of the middle cycle is taken as the isochronous reference interface.
[0035] 2) Set the vertical sampling interval, the specific process is as follows:
[0036] 0.5m is selected as the vertical sampling interval.
[0037] 3) From the isochronous datum interface downwards, the sand top development frequency curve is compiled, the specific process is as follows:
[0038] ①Compile the initial sand top frequency curve
[0039] From the isochronous reference interface down, take the maximum height between th...
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The invention relates to a river facies strata isochronous division method based on an elevation difference. The method comprises the following steps: 1) selecting an isochronous reference interface, 2) setting a vertical sampling interval, 3) compiling a sand top developing frequency curve down from the isochronous reference interface, 4) compiling a sand top developing frequency curve down from the isochronous reference interface, 5) compiling an isochronous stratigraphic interface identification curve, 6) determining an isochronous stratigraphic interface, and 7) dividing isochronous stratigraphic units. The method takes a high-resolution sequence stratigraphy theory as a guide and a metaphase-cycle-telophase flooding mudstone interface as the isochronous reference interface, and the isochronous stratigraphic interface identification curve is built according a sand body developing characteristic and a sand body elevation difference, so the solution multiplicity of river facies strata isochronous stratigraphic division is effectively reduced. A division scheme is adjusted according to a stratigraphic thickness and a vertical rhythm characteristic on the basis of the isochronous stratigraphic division, and a unit division result is objective and fine, so the method can be widely applied to isochronous division of river facies strata.
Description
technical field [0001] The invention relates to an isochronous division method of fluvial facies strata based on elevation difference, and belongs to the technical field of oil and gas field development. Background technique [0002] As the fluvial oilfields in eastern China enter the middle and late stages of development, the distribution of remaining oil is becoming more and more complex, the contradiction between injection and production is becoming more and more prominent, and it is becoming more and more difficult to tap the potential. Fine anatomy is the key technical means to solve the problem. However, fluvial facies reservoirs change rapidly and have strong heterogeneity, and the isochronous division and correlation of the strata has always been a difficult point in oilfield exploration and development. [0003] At present, domestic fluvial facies stratigraphic correlation mainly uses the fine reservoir description technology of Daqing Oilfield. This technology rel...
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IPC IPC(8): G01V9/00
CPCG01V9/00
Inventor 范廷恩王海峰王晖汤婧高玉飞张显文肖大坤栾东肖周建楠井涌泉
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD