CN105822294A - Shale gas reservoir geological evaluation single well modeling method - Google Patents
Shale gas reservoir geological evaluation single well modeling method Download PDFInfo
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- CN105822294A CN105822294A CN201610151759.9A CN201610151759A CN105822294A CN 105822294 A CN105822294 A CN 105822294A CN 201610151759 A CN201610151759 A CN 201610151759A CN 105822294 A CN105822294 A CN 105822294A
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- well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
Abstract
The invention discloses a shale gas reservoir geological evaluation single well modeling method. According to the method, by sequentially carrying out conventional logging, imaging logging and VSP (Vertical Seismic Profile) logging, complete and comprehensive well logging interpretation is made; then by carrying out sidewall coring on a reservoir obtained via well logging interpretation, an obtained core is subjected to electron microscope scanning observation, porosity measurement and a rock strain experiment; then by combining the well logging interpretation and using modeling software, a fracture development model of a single well profile is established. The invention aims to implement comprehensive and accurate establishment of a shale gas reservoir single well geological model so as to facilitate carrying out detailed exploration on basic geological information of a stratum.
Description
Technical field
The present invention relates to geological exploration and development field, relate in particular to shale gas reservoir geologic assessment modeling for single well method.
Background technology
Shale oil gas as energy extraction source newborn in recent years, from thinking the exploitation carrying out petroleum resources the source bed that cannot preserve oil gas in the past, has prospect widely in the world.And different from the pore channel in conventional sandstone reservoir, rammell use crack carry out oil-gas migration, crack both can be that shale gas provides gathering space, it is possible to the production for shale gas provides migration pathway.Mud shale is as a kind of low porosity and low permeability reservoir, and the production mechanism of its oil gas is extremely complex, relates to the mutual relation etc. between adsorbed gas content and free gas content, natural microcrack and pressure break attractive joint.And the natural microcrack in mud shale is divided into build joint, interlayer laminated structure of shale seam, aspect sliding seam, diagenesis to shrink microcrack and organic matter evolution abnormal pressure stitches 5 kinds, its complicated classification, identification feature and governing factor are different.In a word, open shale gas reservoir is not only a big technological innovation to boring Well Completion Engineering of Oil Reservoirs, proposes lot of challenges equally simultaneously for geological prospecting department.Shale gas reservoir is carried out the most comprehensively formation evaluation, is to ensure that the primary guarantee of bigger recovery ratio and economic benefit.But, the domestic shale gas reservoir equal mode of geologic assessment method of the prior art is single, the most comprehensively, it is difficult to provide enough data supports for being drilled well construction and later stage exploitation.
Summary of the invention
For above-mentioned deficiency of the prior art, the present invention proposes shale gas reservoir geologic assessment modeling for single well method, it is achieved set up shale gas reservoir individual well geological model comprehensively and accurately, reaches the purpose being easy to probe into stratum basic geological information in detail.
The present invention is achieved through the following technical solutions:
Shale gas reservoir geologic assessment modeling for single well method, the method includes techniques below step:
A () is in a certain shale gas exploration and development block, according to geological conditions and goal in research demand, choose the prospect pit with symbolical meanings, full well section is carried out resistivity logging, acoustic logging, nutural potential logging, gamma ray log, compensated neutron log, density log, calliper log, obtain the above-mentioned log of target well full well section, make well log interpretation；B () full well section carries out imaging logging, make well log interpretation；C focus is arranged at shaft bottom by (), carry out VSP well logging, makes well log interpretation；D () utilizes the well log interpretation in step (a) ~ (c), in conjunction with drilling engineering data, list all of reservoir, and listed all reservoirs are carried out sidewall coring, all rock cores taken out are carried out electron-microscope scanning observation, porosity determination, rock strain experiment；E (), according to above-mentioned well logging and experimental data, uses modeling software to set up geologic assessment individual well model.
Single for the equal mode of shale gas reservoir geologic assessment method in prior art, the most comprehensive, it is difficult for being drilled well construction and the later stage exploits the problem that the data providing enough are supported, the present invention proposes shale gas reservoir geologic assessment modeling for single well method, first the well location chosen is implemented conventional logging in prospect pit drilling process by the method, well logging project includes but not limited to resistivity, sound wave, natural potential, natural gamma, compensated neutron, density, hole diameter, obtain the above-mentioned log of full well section, make complete well log interpretation, ooze with the earth bore obtaining this well detailed, fluid, the information such as lithology.Again full well section is carried out imaging logging.As identifying crack effective logging mode the most directly perceived, individually carry out an imaging logging operation to be necessary, because Image Logging Data can highlight the rock acoustic impedance and the variation characteristic of resistivity caused because of crack change, reduce the non-crack response impact caused by anthropic factors such as drilling engineerings, thus revising the deficiency that conventional logging technology exists in terms of analyzing crack so that those skilled in the art can also have the understanding of entirety to the crack information in this well stratum.Afterwards, focus is arranged at shaft bottom, carries out VSP well logging, make well log interpretation.VSP logs well, i.e. vertical seismic profile log, reflectance signature difference by seismic wave judges the developmental state in tomography, crack, and the lift height situation between each series of strata, in combination with every Logging Curves, thus confirm this well stratum interrupting layer, gap and geological layer concrete condition.VSP well logging on the basis of imaging logging, can also be drawn the degree of fracture development by the strong and weak feature of echo, enables research worker that the development degree of formation fracture is had quantitative understanding.Afterwards, by above-mentioned all well-log informations, in conjunction with data such as the geological logging in drilling process, drilling parameter changes, list all reservoirs, and listed all reservoirs are carried out sidewall coring, the all rock cores taken out are carried out electron-microscope scanning observation, porosity determination, rock strain experiment, obtains the significant datas such as rock core high-definition picture, porosity and connectivity data, stress-strain diagram with this.According to above-mentioned all data, modeling software is used to set up geologic assessment individual well model.Hereby it is achieved that set up shale gas reservoir individual well geological model comprehensively and accurately, reach the purpose that stratum basic geological information is probed in detail.
Further, the imaging logging described in step (b) is micro-resisitivity image (FMI or EMI).
Further, in the geologic assessment individual well model described in step (e), conventional sandstone reservoir and shale reservoir are made substantially differentiation.Owing to shale reservoir all has difference significantly with conventional sandstone reservoir in Storage mechanism, open mode, therefore they are significantly distinguished, it is simple to separately carry out research program.
The present invention compared with prior art, has such advantages as and beneficial effect:
Shale gas reservoir geologic assessment modeling for single well method of the present invention, by carrying out conventional logging, imaging logging, VSP well logging successively, make complete and comprehensive well log interpretation, reservoir by drawing well log interpretation carries out sidewall coring again, institute's coring is carried out electron-microscope scanning observation, porosity determination, rock strain experiment, in conjunction with well log interpretation, use modeling software to set up institute's coring and carry out electron-microscope scanning observation, porosity determination, rock strain experiment, in conjunction with well log interpretation, modeling software is used to set up the geological model of individual well section.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by the embodiment of the present invention, constitutes the part of the application, is not intended that the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the schematic process flow diagram of one specific embodiment of the present invention.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and the exemplary embodiment of the present invention and explanation thereof are only used for explaining the present invention, not as a limitation of the invention.
Embodiment 1:
Shale gas reservoir geologic assessment modeling for single well method as shown in Figure 1, the method includes techniques below step: (a) is in a certain shale gas exploration and development block, according to geological conditions and goal in research demand, choose the prospect pit with symbolical meanings, full well section is carried out resistivity logging, acoustic logging, nutural potential logging, gamma ray log, compensated neutron log, density log, calliper log, obtain the above-mentioned log of target well full well section, make well log interpretation；B () full well section carries out micro-resisitivity image, make well log interpretation；C focus is arranged at shaft bottom by (), carry out VSP well logging, makes well log interpretation；D () utilizes the well log interpretation in step (a) ~ (c), in conjunction with drilling engineering data, list all of reservoir, and listed all reservoirs are carried out sidewall coring, all rock cores taken out are carried out electron-microscope scanning observation, porosity determination, rock strain experiment；E (), according to above-mentioned well logging and experimental data, uses modeling software to set up geologic assessment individual well model, and conventional sandstone reservoir and shale reservoir is made substantially differentiation in a model.In the present embodiment, first in prospect pit drilling process, the well location chosen is implemented conventional logging, well logging project includes but not limited to resistivity, sound wave, natural potential, natural gamma, compensated neutron, density, hole diameter, obtain the above-mentioned log of full well section, make complete well log interpretation, to obtain the detailed earth bore of this well and ooze, the information such as fluid, lithology.Again full well section is carried out imaging logging, make up the deficiency that conventional logging technology exists in terms of analyzing crack so that those skilled in the art can also have the understanding of entirety to the crack information in this well stratum.Afterwards, focus is arranged at shaft bottom, carries out VSP well logging, make well log interpretation, thus confirm this well stratum interrupting layer, gap and geological layer concrete condition, enable research worker that the development degree of formation fracture is had quantitative understanding simultaneously.Afterwards, by above-mentioned all well-log informations, in conjunction with data such as the geological logging in drilling process, drilling parameter changes, list all reservoirs, and listed all reservoirs are carried out sidewall coring, the all rock cores taken out are carried out electron-microscope scanning observation, porosity determination, rock strain experiment, obtains the significant datas such as rock core high-definition picture, porosity and connectivity data, stress-strain diagram with this.According to above-mentioned all data, modeling software is used to set up geologic assessment individual well model.Hereby it is achieved that set up shale gas reservoir individual well geological model comprehensively and accurately, reach the purpose that stratum basic geological information is probed in detail.
Upper described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only the detailed description of the invention of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the present invention.
Claims (3)
1. shale gas reservoir geologic assessment modeling for single well method, it is characterised in that the method includes techniques below step:
A () is in a certain shale gas exploration and development block, according to geological conditions and goal in research demand, choose the prospect pit with symbolical meanings, full well section is carried out resistivity logging, acoustic logging, nutural potential logging, gamma ray log, compensated neutron log, density log, calliper log, obtain the above-mentioned log of target well full well section, make well log interpretation；
B () full well section carries out imaging logging, make well log interpretation；
C focus is arranged at shaft bottom by (), carry out VSP well logging, makes well log interpretation；
D () utilizes the well log interpretation in step (a) ~ (c), in conjunction with drilling engineering data, list all of reservoir, and listed all reservoirs are carried out sidewall coring, all rock cores taken out are carried out electron-microscope scanning observation, porosity determination, rock strain experiment；
E (), according to above-mentioned well logging and experimental data, uses modeling software to set up geologic assessment individual well model.
Shale gas reservoir geologic assessment modeling for single well method the most according to claim 1, it is characterised in that: the imaging logging described in step (b) is micro-resisitivity image (FMI or EMI).
Shale gas reservoir geologic assessment modeling for single well method the most according to claim 1 and 2, it is characterised in that: in the geologic assessment individual well model described in step (e), conventional sandstone reservoir and shale reservoir are made substantially differentiation.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111749678A (en) * | 2020-07-06 | 2020-10-09 | 宋立才 | Method and device for determining occurrence time of shale gas reservoir failure event |
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