Well logging interpretation method for low-permeability heterogeneous gas reservoir
A logging interpretation and heterogeneity technology, applied in the field of logging interpretation and evaluation of unconventional reservoirs, can solve problems such as large apparent resistivity, insignificant difference between gas layer and water layer apparent resistivity, and poor stability of acoustic logging , to achieve the effect of improving the interpretation accuracy
Active Publication Date: 2020-01-14
XI'AN PETROLEUM UNIVERSITY
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However, for reservoirs with low formation water salinity, the low salinity of formation water makes the apparent resistivity difference between the gas layer and the water layer on the logging curve not obvious, and the apparent resistivity of the water layer in individual intervals is on the contrary higher than that of the gas layer. Large apparent resistivity
Acoustic time difference will have a "cycle jump" phenomenon in the loose gas-bearing sandstone section, which leads to the defect of poor stability in the identification of gas and water layers in acoustic logging
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[0046] A specific embodiment is given below, and the method is illustrated by taking a certain oilfield block as an example.
[0047] A logging interpretation method for low-permeability heterogeneous gas reservoirs, comprising the following steps:
[0048] Step 1: Select the logging data of the target oilfield block, and optimize the logging data in the logging data to select the logging data of lithology series, porosity series and resistivity series; the lithology series include spontaneous potential, natural gamma ray, well diameter and natural gamma ray logging data; porosity series include density, acoustic time difference and neutron logging data; resistivity series include lateral logging, induction logging, micro-resistivity and R0.25, R0.45, R2 .5. R4 logging data;
[0049] The cores of the coring wells are homing, and the depth correction of the porosity of the core analysis is performed using the acoustic transit time curve as a benchmark; the depth correction of th...
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The invention discloses a well logging interpretation method for a low-permeability heterogeneous gas reservoir, and the method comprises the steps: determining the physical property lower limit and electrical property lower limit of the low-permeability heterogeneous gas reservoir through the processing and analysis of well logging data of a research block on the basis of the recognition of related geological data of the research block. The logging interpretation method for the reservoir parameters can improve the stability of logging interpretation of the low-permeability heterogeneous gas reservoir at present.
Description
technical field [0001] The invention belongs to the technical field of logging interpretation and evaluation of unconventional reservoirs, and relates to a method for logging interpretation of low-permeability heterogeneous gas reservoirs. Background technique [0002] Logging data interpretation and reservoir evaluation of low-porosity and low-permeability reservoirs have always been difficult problems faced by oilfields at home and abroad. The differences in depositional environment, sedimentary facies belt and diagenesis result in various pore types, complex pore structures and strong reservoir heterogeneity in low-porosity and low-permeability reservoirs. The extremely strong heterogeneity and complex pore structure control the fluid seepage and conductivity of low-porosity and low-permeability reservoirs, directly affecting the physical parameters of the reservoir and the electrical response characteristics of oil, gas and water layers. [0003] Theoretically speaking,...
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IPC IPC(8): G06F30/20E21B49/00
CPCE21B49/00
Inventor 王瑞飞唐颖王振鑫汪广轮李博文郑森刘伟张建亭李敬良
Owner XI'AN PETROLEUM UNIVERSITY