CN110018527B - Valance source oil-gas dynamic reservoir exploration method - Google Patents
Valance source oil-gas dynamic reservoir exploration method Download PDFInfo
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- CN110018527B CN110018527B CN201910336130.5A CN201910336130A CN110018527B CN 110018527 B CN110018527 B CN 110018527B CN 201910336130 A CN201910336130 A CN 201910336130A CN 110018527 B CN110018527 B CN 110018527B
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Abstract
The invention relates to the technical field of petroleum and natural gas exploration, and discloses a mantle-derived oil-gas dynamic reservoir exploration method, which comprises the following steps: s1, determining the space range of low-speed, low-resistance and low-density bodies existing in the deep part of the underground in the target range; s2, searching a shallow fuzzy band in the target range; s3, finding a fracture system for communicating a low-speed, low-resistance and low-density body with a shallow oil-gas reservoir; s4, performing surface survey in a target range, searching oil seedlings, and performing surface microorganism detection and surface soil gas detection; s5, carrying out projection integration on the regions obtained in S1, S2 and S3 in space, and circling out a plane range; and S6, determining the well position by combining the plane range circled in S5 and the surface survey result obtained in S4. The mantle-source oil-gas dynamic oil-gas reservoir exploration method disclosed by the invention is used for exploring a shallow oil-gas reservoir with a deep source, and makes a great contribution to solving the increasingly tense energy crisis.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas exploration, in particular to a mantle-derived oil-gas dynamic reservoir exploration method.
Background
Oil and gas resources are indispensable energy sources in the society at present, with the progress of various technologies and social development, the world consumes more and more tremendous oil and gas resources, and with the exploration and development of oil and gas, the original oil and gas reservoir exploration method is difficult to meet the practical requirements.
According to the existing oil and gas reservoir exploration method, after the exploration of an oil and gas reservoir area is completed, the oil and gas reservoir trapping exploration is carried out, namely, the structures (anticline, broken nose and the like) which are beneficial to formation in an underground rock stratum are identified by a geophysical prospecting method, and the structures are verified by a drilling method. In the prior art, traps are classified into conventional traps, i.e., formation traps, and unconventional traps, which include lithologic traps, formation traps, and the like. Trap exploration is generally accomplished by the following several steps. First, a certain trap is found, and the type of trap is determined according to the evaluation criteria of each trap. Secondly, determining whether the trap meets geological conditions containing oil gas: whether an oil source exists, namely whether the connection exists with a hydrocarbon source rock or not, and whether the possibility of oil gas self-generation or migration exists or not; whether the structure trap has shielding conditions or not, wherein the stratum trap has a cover layer, and the structure trap has a bulge, has bottom water and side water and is not positioned at a trap overflow point; and thirdly, whether the oil-gas well reservoir has good reservoir conditions or not, the pore permeability reaches the standard of oil-gas storage, and the oil-gas well reservoir has good conductivity, reservoir pressure and the like. And thirdly, estimating the resource amount of the trap reaching the geological condition containing the oil gas, evaluating the exploration economic benefit, and drawing out the drilling target favorable for delineating the drilling well position after all the traps reach the standard. No matter what kind of trap exploration is, the main exploration method used by the trap exploration method is seismic technology, and after the trap is trapped, logging is combined to search for an oil and gas reservoir, and the purpose is to search for oil and gas reservoir resources of a relatively shallow layer.
However, in actual exploration, a large number of situations occur that an oil-gas reservoir cannot be found after trapping is implemented, that is, the trapping is not controlled, and the trap is searched for, not the oil-gas reservoir but a container for storing oil and gas essentially, but the container does not necessarily have the oil and gas, so that the failure rate is over 50%.
Disclosure of Invention
The invention aims to provide a mantle-derived oil-gas dynamic reservoir exploration method, which rearranges and combines the existing oil-gas exploration technical methods aiming at mantle-derived oil gas, thereby being capable of exploring shallow oil-gas reservoirs with deep sources and making a great contribution to solving the increasingly tense energy crisis.
The mantle source oil pneumatic oil-gas reservoir exploration method provided by the invention comprises the following steps:
s1, determining the space range of low-speed, low-resistance and low-density bodies existing in the deep part of the underground in the target range;
s2, searching a shallow fuzzy band in the target range;
s3, finding a fracture system for communicating a low-speed, low-resistance and low-density body with a shallow oil-gas reservoir;
s4, performing surface survey in a target range, searching oil seedlings, and performing surface microorganism detection and surface soil gas detection;
s5, carrying out projection integration on the regions obtained in S1, S2 and S3 in space, and circling out a plane range;
and S6, determining the well position by combining the plane range circled in S5 and the surface survey result obtained in S4.
By adopting the technical scheme, the positions of oil gas generated by heating of the inorganic formation of the mantle, oil gas generated by the serpentines of the middle and lower shells and the mantle thermal fluid entering the coal-series stratum of the upper shell and the mudstone stratum rich in kerogen are determined, namely exploration is carried out aiming at the shallow oil-gas reservoir with deep sources, and great contribution is made to solving the increasingly tense energy crisis.
In some embodiments, at S1, seismic, electrical, and gravity surveys are used to determine the spatial extent of low velocity, low resistivity, low density bodies deep in the subsurface.
By adopting the technical scheme, the low-speed area range, the low-resistance high-conductivity area range and the low-density body range in the area are determined according to seismic exploration, the low-resistance high-conductivity area range and the electrical exploration in the area are determined, and the density abnormal area in the target area is determined through gravity exploration, so that the low-speed area range, the low-resistance high-conductivity area range and the low-density body range in the area are respectively obtained.
In some embodiments, the low-velocity region is tested by using seismic waves, the low-resistance region is determined by the resistivity, the low-density region is determined by gravity exploration data, and the overlapping area of the low-velocity region, the low-resistance region and the low-density region is the spatial range of the low-velocity, low-resistance and low-density bodies.
By adopting the technical scheme, if the seismic wave velocity of a certain area is less than that of the upper layer, the seismic wave velocity of the area is inverted, and the area is a low-velocity area; the resistivity is 10 Ω · m or less, and the resistivity is 100 Ω · m or more, and the low resistance region is defined. Low resistance, i.e., high conductance, high resistance, i.e., low conductance; the gravity anomaly is the comprehensive reflection of the underground density inhomogeneity, and the distribution position and the geometric shape of the underground low-density region of the exploration region can be defined through the corresponding processing technology.
In some embodiments, the specific method of S2 is: in the low-speed and low-resistance range determined in S1, in a shallow region with the burial depth of 10km, a broken and discontinuous broken zone of the same-phase axis is searched through a shallow seismic section, and the broken and discontinuous broken zone is a shallow fuzzy zone.
By adopting the technical scheme, the shallow fuzzy zone is the exhaust channel, and the well position can be conveniently determined by determining the exhaust channel.
In some embodiments, the fracture system in S3 includes shallow fractures and deep fractures, where shallow fractures are identified using three-dimensional seismic and deep fractures are identified by remote sensing, geodetic or physical exploration.
By adopting the technical scheme, the existence of the fracture system for communicating the low-speed, low-resistance and low-density body with the shallow oil-gas reservoir can slowly and continuously transmit oil gas moved upwards in the deep low-speed, low-resistance and low-density body to the shallow position by means of the formation pressure difference, and the well position can be conveniently determined by determining the fracture system for communicating the low-speed, low-resistance and low-density body with the shallow oil-gas reservoir.
In some embodiments, identifying by remote sensing various geomorphologic, depositional, magmatic, and tectonic markers of deep fractures includes: linear distribution of grabens, valleys, lakes and depressions; there is basal-suprabasal invasion of rock mass in zonal distribution, extended zonal granite with deep source olivine-trap, modern or ancient volcanoes in linear distribution, increasing hydrothermal alteration in zonal distribution, and dikes, veins and magma-related minerals in apparent zonal distribution; the earth surface fault is densely distributed, and the wrinkle effect is strong and complex in a narrow and long zone; the buried depth of the conradd surface and the mohuo surface is suddenly changed, the gravity gradient is suddenly changed, and particularly, a positive and negative abnormal sharp change zone, a linear positive magnetic abnormal zone and a deep source seismic zone are formed.
In some embodiments, the presence of the serpentine jacket region is identified by geodetic measurements.
In some embodiments, relatively good continuity of high magnetic anomaly bands, lines of zero vertical derivatives of gravity, residual gravity anomalies, Bragg gravity anomalies, and discontinuity bands of wide-angle seismic sections are found by physical exploration.
By combining the technical scheme, the position and the range of the deep and large fracture can be accurately deduced.
In some embodiments, S4 includes:
s41, finding the oil gas outcrop through field on-site reconnaissance, and delineating the oil seedling position;
s42, detecting surface microorganisms, mainly detecting the quantity and activity of methane-oxidizing bacteria, and enclosing an area with large quantity and high activity of the surface methane-oxidizing bacteria;
s43, detecting and analyzing the gas content in the soil of the target area by using the conventional soil gas measurement and soil gas accumulation absorption measurement technology, mainly detecting methane gas, determining the background value of the methane gas in the soil of the target area, and enclosing the range of the abnormal value of the methane.
By adopting the technical scheme, the position of the oil seedling, the abnormal range of the methane-oxidizing bacteria and the abnormal range of the methane in the soil gas are projected onto a target area plan marked with the low-speed, low-resistance and low-density body plan range, so that the well position is conveniently determined.
In summary, compared with the prior art, the mantle-derived oil-gas dynamic reservoir exploration method provided by the invention has the beneficial technical effects that:
by exploring the space range of low-speed, low-resistance and low-density bodies in the deep underground part, the fuzzy zone and the fracture or crack zone in the middle and shallow parts; the surface of the earth has methane-oxidizing bacteria abnormity and a region with methane gas detection abnormity by soil gas; and the areas with methane oxidizing bacteria abnormity on the earth surface and methane gas abnormity measured by soil gas determine the positions of oil gas generated by heating of inorganic formation of a mantle, oil gas generated by serpentine of middle and lower crustal and mantle thermal fluid entering an upper crustal coal system stratum and a mudstone stratum rich in kerogen, namely, the shallow oil-gas reservoir with deep sources is explored, and great contribution is made to solving the increasingly tense energy crisis.
Drawings
FIG. 1 is a schematic flow structure diagram of a mantle-derived oil aerodynamic reservoir exploration method provided by the invention.
Fig. 2 is a schematic structural view of the determination of the spatial range of the low-velocity, low-resistance, low-density body existing in the deep underground part in S1.
FIG. 3 is a schematic diagram of a valance source oleopneumatic reservoir exploration mode provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The mantle source oil gas theory considers that besides the upper crust, three air rings exist in the middle and lower crust (from the depth of 10000m to the surface of a Mohuo), the upper crust and the core, and the upper crust and the total four air rings exist. The valance source oil-gas theory is to find oil-gas reservoirs, wherein a part of the oil-gas reservoirs are distributed in the upper crust (a part is found according to the traditional theory, but a part is not found), and more parts of the oil-gas reservoirs are distributed in the middle and lower crust (namely, the low-speed, low-resistance and low-density bodies of the middle and lower crust).
A mantle source oil-gas dynamic reservoir exploration method is shown in figure 1 and comprises the following steps:
and S1, determining the space range of the low-speed, low-resistance and low-density body existing in the underground deep part in the target range. The method specifically comprises the following steps:
s11, determining the low-speed area range in the area through seismic exploration
Generally, when seismic waves propagate in underground rocks, the wave velocity of the seismic waves increases along with the increase of the burial depth, if the seismic wave velocity of a certain region is smaller than that of an upper layer, the seismic wave velocity of the region is inverted, and the region is a low-velocity region. According to the seismic data acquired by the target area, the range of the low-speed area can be marked according to the principle, and the space coordinate of the low-speed area is extracted.
S12, determining the range of the low-resistance high-conductivity region in the region through electrical prospecting
The resistance in the formation is uncertain and even the same rock does not have a fixed value but floats within a certain range. Generally, a region having a resistivity of 10 Ω · m or less can be classified as a low-resistance region, and a region having a resistivity of 100 Ω · m or more can be classified as a high-resistance region. Low resistance, i.e., high conductance, and high resistance, i.e., low conductance. According to the electrical prospecting data collected by the target area, the range of the low-resistance high-conductivity area can be drawn according to the principle, and the space coordinates of the low-resistance high-conductivity area are extracted.
S13, determining density abnormal area in the target area according to gravity exploration
The gravity anomaly is the comprehensive reflection of the underground density inhomogeneity, and the distribution position and the geometric shape of the underground low-density region of the exploration region can be defined through the corresponding processing technology. And drawing the range of the low-density area according to the gravity exploration data acquired from the target area, and extracting the space coordinates of the low-density area.
And S14, as shown in figure 2, projecting the space coordinates of the abnormal areas circled by the seismic, electrical and gravity prospecting with the same coordinate system, wherein the overlapped area is the space range of low speed, low resistance and low density body.
And S15, integrating the spatial ranges of the low-speed, low-resistance and low-density bodies on each measuring line, drawing out the plane ranges of the low-speed, low-resistance and low-density bodies, and projecting the plane ranges on a target area plan.
And S2, searching a shallow fuzzy band in the target range. Specifically, in the low-speed and low-resistance range determined in S1, a shallow region with the burial depth of 10km is used for searching a broken and discontinuous broken zone with a homophase axis through a shallow seismic section, namely a shallow fuzzy zone, namely an exhaust channel. It should be noted that the volcanic passage may also serve as an exhaust passage.
S3, finding a fracture system for communicating low-speed, low-resistance, low-density bodies with shallow oil and gas reservoirs.
The fracture system comprises deep fractures and shallow fractures, the shallow fractures can be identified by using a three-dimensional earthquake, and the deep fractures are relatively complex. The deep and large fracture refers to regional and large fracture which is large in scale and deep into the ground and long in development time, the cutting depth of the fracture can reach the lower crust, even the fracture penetrates through the crust and extends into the mantle, and the fracture has the characteristics of large cutting depth, long space extension, long-term development and inheritance and the like. The judgment of the deep and large fracture has a plurality of marks, including geomorphology marks, sedimentary marks, magmatic marks, tectonic marks and geophysical marks. The marks can be effectively identified through conventional technologies such as remote sensing, geodetic surveying and physical exploration, so that deep and large fractures can be identified.
(1) Remote sensing technology: the remote sensing technology is used for interpreting and analyzing geological structures and identifying various geomorphologic marks, sedimentary marks, magmatic activity marks and structural marks of deep and large fractures. Such as: linear distribution of grabens, valleys, lakes and depressions; the two sides of the linear land are commonly provided with internally-landed fault basins which are distributed in a bead-string shape; the magma activity area has basal-suprabasal invasion rock mass distributed in a strip shape, granite extending in a strip shape and containing deep source olive rock image-capturing bodies, modern or ancient volcanoes distributed in a strip shape, hydrothermal alteration distributed in a strip shape and increasing gradually, and dikes, veins and mineral products related to magma distributed in a remarkable strip shape; in a long and narrow zone, earth surface faults are densely distributed, the wrinkling effect is strong and complex, obvious chip-making belts, splitting belts, joint crushing belts and power crushing belts appear, the structure extends in a strip shape, and the direction of the main body of the structure is inconsistent with the directions of two sides; the buried depth of the conradd surface and the mohuo surface is suddenly changed, the gravity gradient is suddenly changed, and particularly, a positive and negative abnormal sharp change zone, a linear positive magnetic abnormal zone, a deep source seismic zone and the like are suddenly changed.
(2) The ground measurement technology comprises the following steps: and determining a stratum sequence and establishing a geological model by observing the field geological outcrop and combining means such as geological shallow drilling, profile well construction and the like. By this technique, geomorphologic, sedimentary, magmatic and tectonic signs of deep fractures can be mapped. Valance-derived oil and gas theory suggests that the snake-green rock sleeve comes from the valance, and generally, when the snake-green rock sleeve is found on the surface, deep and large fractures are inevitably generated below the snake-green rock sleeve.
(3) Physical exploration technology: comprehensively analyzing high magnetic anomaly zones with better continuity found by earth electromagnetic sounding, zero lines of vertical derivatives of gravity, residual gravity anomaly, grid gravity anomaly and discontinuous zones of wide-angle seismic sections.
By comprehensively explaining the results obtained by the method, the position and the range of the deep and large fracture can be accurately deduced.
And S4, performing surface survey in the target range, searching oil seedlings, and performing surface microorganism detection and surface soil gas detection. The method specifically comprises the following steps:
s41, finding the oil gas outcrop through field reconnaissance, and delineating the oil seedling position.
And S42, detecting the surface microorganisms, mainly detecting the quantity and activity of the methane-oxidizing bacteria, and enclosing the area with large quantity and high activity of the surface methane-oxidizing bacteria.
Under the drive of stratum pressure, the light hydrocarbon gas in oil-gas reservoir can continuously make vertical diffusion and transportation to earth surfaceIf the oil and gas reservoir exists underground, the obligate microorganism taking light hydrocarbon gas as the only carbon source and energy in the soil must develop very well in the soil above the soil, so that microorganism abnormality is formed, the microorganism abnormality is caused by the existing hydrocarbon leakage, the hydrocarbon leakage which has occurred historically cannot be reflected, and the oil and gas leakage abnormality discovered by the microorganism exploration has practical significance. The methane-oxidizing bacteria can only utilize C1The compound does not depend on saccharides or other organic matters, has a special hydrocarbon oxidation flora with high specificity, and selects methane oxidation bacteria as a main detection basis. The abnormality of the surface microorganisms can be judged by detecting the number and the activity of the methane-oxidizing bacteria, so that whether the underground oil-gas reservoir exists or not is judged.
S43, detecting and analyzing the gas content in the soil of the target area by using the conventional soil gas measurement and soil gas accumulation absorption measurement technology, mainly detecting methane gas, determining the background value of the methane gas in the soil of the target area, and enclosing the range of the abnormal value of the methane.
The concrete operation of the conventional soil gas measuring technology is as follows: drilling with 8.9cm diameter spiral drill to a depth of at least 4 m, placing soil gas sampler sealing device at the bottom of the hole, inflating rubber plug to isolate the bottom of the hole from atmosphere, pumping out soil gas, and sending the gas into gas chromatograph for light hydrocarbon (CH)4、C2H6、C2H4、C3H8、C3H6、C4H10Etc.), He, H2And CO2And the like. The invention mainly measures methane gas.
The specific operation of the soil gas accumulative absorption measurement technology is as follows: coating activated carbon of several milligrams on the end part of a thin bar by using an inorganic adhesive as a collector, then inversely placing the collector into a soil pit of 30-60 cm, covering the collector with a sealing cover and burying the collector with soil, and recovering, sealing and sending the collector to a laboratory for analysis after the inversely placed collector and gaseous hydrocarbon gas leaked into the upper pit are in a balanced state (generally 1-2 weeks, wherein the time depends on different regions and seasons). The present invention mainly analyzes methane gas.
And S5, projecting and integrating the areas obtained in S1, S2 and S3 in space, enclosing a plane range, and projecting the position where the oil seedling appears, the abnormal range of methane-oxidizing bacteria and the abnormal range of methane in soil gas onto a target area plane map marked with the plane range of a low-speed, low-resistance and low-density body.
And S6, determining the well position by combining the plane range circled in S5 and the surface survey result obtained in S4.
As shown in fig. 3, according to the mantle source oil-gas theory, oil-gas exists in low-speed, low-resistance and low-density bodies of the lower and middle crustae in the deep part, and the middle and shallow fuzzy zone and the fracture system serve as migration channels for upwelling of the oil-gas in the deep part. The deployment of well locations is divided into three cases in combination with the results obtained by the above-mentioned oil and gas exploration techniques.
(1) When a shallow oil and gas reservoir is found, conventional oil and gas well exploitation exists, the yield is continuously reduced, but the accumulated yield far exceeds the estimated reserve; the middle and lower shells have low-speed, low-resistance and low-density bodies; the middle-shallow part has fuzzy zone or fracture system to communicate low speed, low resistance and low density body and found oil-gas reservoir.
The oil-gas well yield is reduced, but the accumulated yield greatly exceeds the estimated yield when the oil-gas well yield is found, and the fact that the oil source supplements the shallow oil-gas resource is proved, but the supplement speed is lower than the exploitation speed. The existence of the fuzzy zone and the fracture or the crack of the middle and shallow parts can transmit the oil gas which is transported upwards in the deep low-speed, low-resistance and low-density body to the shallow oil-gas reservoir slowly but continuously just by means of the pressure difference of the stratum, so that the production amount of the oil-gas well is far beyond the estimated reserve amount. According to the conjecture, only a horizontal well which is directly communicated with a low-speed, low-resistance and low-density body and a middle-shallow fuzzy zone or a fracture system of a shallow oil and gas reservoir needs to be drilled near a conventional oil and gas exploitation well.
(2) The surface of the earth has methane-oxidizing bacteria abnormality and soil gas methane gas detection abnormality; the middle and lower shells have low-speed, low-resistance and low-density bodies; the middle-shallow part is provided with a fuzzy band or a fracture system for communicating low-speed, low-resistance and low-density bodies; the shallow portion has not yet formed a trap; there are no conventional oil and gas wells. In the case, the ultra-deep well is drilled in the area with the highest surface microorganism and gas measurement abnormal value directly to the top end of a middle-shallow fuzzy zone or a fracture system.
(3) The surface of the earth has methane-oxidizing bacteria abnormality and soil gas methane gas detection abnormality; the middle and lower shells have low-speed, low-resistance and low-density bodies; shallow traps where no reservoir has been found; the middle-shallow part is provided with a fuzzy band or a fracture system for communicating low speed, low resistance, low dense body and shallow part trap; there are no conventional oil and gas wells. In this case, the area with the highest surface microorganism and gas-measuring abnormal value is searched above the shallow trap, and the well is drilled to the shallow trap.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. The valance source oil-gas dynamic reservoir exploration method is characterized by comprising the following steps:
s1, determining the space range of low-speed, low-resistance and low-density bodies existing in the deep part of the underground in the target range;
s2, searching a shallow fuzzy band in the target range;
s3, finding a fracture system for communicating a low-speed, low-resistance and low-density body with a shallow oil-gas reservoir;
s4, performing surface survey in a target range, searching oil seedlings, and performing surface microorganism detection and surface soil gas detection;
s5, carrying out projection integration on the regions obtained in S1, S2 and S3 in space, and circling out a plane range;
and S6, determining the well position by combining the plane range circled in S5 and the surface survey result obtained in S4.
2. The method of claim 1, wherein the seismic, electrical, and gravity surveys are used to determine the spatial extent of low velocity, low resistivity, low density bodies in the deep subsurface at S1.
3. The method of claim 2, wherein the seismic waves are used to test low velocity zones, the resistivity is used to determine low resistivity zones, the gravity survey data is used to determine low density zones, and the overlapping area of the low velocity zones, the low resistivity zones, and the low density zones is the spatial range of the low velocity, the low resistivity zones, and the low density zones.
4. The valance source oleopneumatic reservoir exploration method according to claim 1, wherein S2 is implemented by the following steps: in the low-speed and low-resistance range determined in S1, in a shallow region with the burial depth of 10km, a broken and discontinuous broken zone of the same-phase axis is searched through a shallow seismic section, and the broken and discontinuous broken zone is a shallow fuzzy zone.
5. The method of claim 1, wherein the fracture system at S3 comprises shallow fractures and deep fractures, wherein the shallow fractures are identified using three-dimensional seismic and the deep fractures are identified by remote sensing, geodetic or physical exploration.
6. The valance source oleopneumatic reservoir exploration method according to claim 5, wherein identifying by remote sensing various geomorphologic, depositional, magmatic, and tectonic markers of deep fractures comprises: linear distribution of grabens, valleys, lakes and depressions; there is basal-suprabasal invasion of rock mass in zonal distribution, extended zonal granite with deep source olivine-trap, modern or ancient volcanoes in linear distribution, increasing hydrothermal alteration in zonal distribution, and dikes, veins and magma-related minerals in apparent zonal distribution; the earth surface fault is densely distributed, and the wrinkle effect is strong and complex in a narrow and long zone; the buried depth of the conradd surface and the mohuo surface is suddenly changed, the gravity gradient is suddenly changed, and a linear normal magnetic abnormal zone and a deep source seismic zone are formed.
7. The method of valance source oleopneumatic reservoir exploration according to claim 5, characterized by the presence of serpentinite sleeve areas identified by geodetic measurements.
8. The mantle source oleopneumatic reservoir exploration method of claim 5, wherein relatively good continuity of high magnetic anomaly bands, zero lines of vertical derivatives of gravity, residual gravity anomaly, grid gravity anomaly, and wide angle seismic profile discontinuity bands are found by physical exploration.
9. The method of exploration of valance-source oleopneumatic reservoirs of claim 1, wherein S4 comprises:
s41, finding the oil gas outcrop through field on-site reconnaissance, and delineating the oil seedling position;
s42, detecting surface microorganisms, mainly detecting the quantity and activity of methane-oxidizing bacteria, and enclosing an area with large quantity and high activity of the surface methane-oxidizing bacteria;
s43, detecting and analyzing the gas content in the soil of the target area by using the conventional soil gas measurement and soil gas accumulation absorption measurement technology, mainly detecting methane gas, determining the background value of the methane gas in the soil of the target area, and enclosing the range of the abnormal value of the methane.
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| 断层与幔源二氧化碳气藏的形成和分布――以渤海湾盆地济阳坳陷为例;李理等;《岩石学报》;20160715;第34卷(第07期);第1-12页 * |
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