CN1532561A - Three-dimensional differential electric detection technology - Google Patents
Three-dimensional differential electric detection technology Download PDFInfo
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- CN1532561A CN1532561A CNA031209637A CN03120963A CN1532561A CN 1532561 A CN1532561 A CN 1532561A CN A031209637 A CNA031209637 A CN A031209637A CN 03120963 A CN03120963 A CN 03120963A CN 1532561 A CN1532561 A CN 1532561A
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Abstract
The present invention relates to a kind of geophysical exploration method with a data acquisition system and a data processing system. The data acquisition system consists of an emitting system and a receiving system, the emitting system realizes multipoint and multi-waveform powering via underground and well electrodes, and the receiving system consists of mainly ground 3D multi-ring electromagnetic signal receiving network. The data processing system obtains underground 3D lithologic characteristic distribution information through 3D forward and reversal development. The method is used mainly in development and monitoring of oil and gas field and search of residual oil distribution, and is simple, fast, practical and low in cost.
Description
Relate to the field
The invention belongs to geophysical exploration method.
Background technology
Oil-gas field development monitoring and when seeking underground residue hydrocarbon occurrence needs to understand the situations such as lithology horizontal change of underground fluid dynamic change and formation at target locations.At present, seismic exploration technique obtains preliminary application in this field, but its cost costliness, technology is prematurity still, effect and so on and so forth.And ground electrical method and surface em method exploration engineering adopt the method for surface power supply and ground survey, and field source excites away from exploration targets, and are difficult to realize the multi-point shooting at target, and exploration resolution is low, can not satisfy production requirement.
Summary of the invention
The present invention adopts the large power, electrically magnetic method to carry out three-dimensional differential and electrically surveys.This method is divided into acquisition system and handles interpre(ta)tive system, and acquisition system comprises emission coefficient and receiving system, and both are synchronous by GPS GPS mode.Emission coefficient comprises generator, signal transmitter, and electric power conductor and electrode etc.Receiving system comprises central controller, digital collection station, and electromagnetic probe etc.The alternating current that generator sends obtains the required multiple waveform signal that excites through the signal transmitter rectification, and waveform comprises: the positive and negative square wave of periodicity, intermittent square wave etc., marking current intensity is 50～100 peaces.Power to subterranean strata by electric power conductor and electrodes of A and B.Wherein, electrode B is positioned at ground, and electrode A is positioned at the down-hole.Electrodes of A moves from the top down during work, moves from bottom to top then.
In surface deployment is the three-dimensional ring network reception electric field signal at center with the well, receives field signal with bar magnet.The electric field measurement network is the annular concentric of 3 rings to 10 rings, and 8 to 100 electric field receiving transducers are set on every ring, and is end to end, also interconnects between ring and the ring; Magnet field probe is arranged on the adapter ring of electric field survey grid, and symmetry is laid 4 to 24 magnetic probes.Central controller transmits the acquisition controlling order by cable to acquisition station, and the signal record that acquisition station receives electric field probe and magnetic probe is in internal memory.
By three-dimensional FORWARD AND INVERSE PROBLEMS simulation process, can obtain underground three-dimensional electrical structure data volume indoor to the ground survey result.By section to the inverting data, can obtain the far and near relative electrical property difference of the electrical relative different of different directions and hole diameter direction, can obtain the vertically electrical vertically electrical section in curve and at least 24 orientation that compares with the electric logging essential characteristic.Has higher confidence level for oilfield exploitation monitoring and searching residue oil gas.
Description of drawings:
The electrical Detection Techniques field construction of Fig. 1 three-dimensional differential synoptic diagram
Concrete enforcement
Embodiment:, be the monitoring nets (Fig. 1) that 4 rings are laid at the center with the well on ground according to subsurface deposit target sizes and depth disparity.The electric field survey grid is to arrange 24 electric field receiving transducers on each ring, and the electric field receiving transducer on each ring is end to end, has 8 electric field receiving transducers to interconnect between ring and the ring.Highly sensitive magnet field probe is arranged on electric field survey grid the 3rd ring from inside to outside, and symmetry is laid 8 magnet field probes.
Excite the field source vertical ground, wherein A and B are two transmitting electrodes (Fig. 1), and electrode B is fixed in the ground well head, and electrode A is positioned at the down-hole.Generator sends alternating current during work, obtains positive and negative square wave excitation current of cycle by the signal transmitter rectification, and strength of current is 80 peaces.Excitation current by electric power conductor and electrode A and B to underground power supply.Central controller transmits the acquisition controlling order by cable to acquisition station, power supply utmost point A earlier from top to bottom during collecting work, the signal record that multi-point shooting (points such as the A1 among Fig. 1, A2) from bottom to top then, acquisition station receive electric field and magnetic probe is in internal memory.
After data acquisition is finished, carry out three-dimensional FORWARD AND INVERSE PROBLEMS simulation process indoor.Three-dimensional forward simulation adopts integral equation method, and the generalized inverse inverting is adopted in inverting.At first, set up underground initial model,, make ground measured data and Model Calculation match, thereby obtain the underground three-dimensional electrical structure of whole monitoring net by progressively revising model.
Claims (7)
1. electrical detection method of three-dimensional differential, it is a kind of great-power electromagnetic detection method, it is characterized in that: detection system is made up of acquisition system and processing interpre(ta)tive system, wherein, acquisition system comprises emission coefficient and receiving system, emission coefficient is sent the excitation current of multiple waveform, powers to subterranean strata by the transmitting electrode of electric power conductor and ground and down-hole; Receive electric field signal and field signal at the surface deployment loop network; The electric field measurement network is the annular concentric of 3 rings to 10 rings, and several electric field receiving transducers are set on every ring; Adopt the magnetic field receiving transducer to receive field signal, the magnetic field receiving transducer is arranged on the adapter ring of electric field survey grid.
2. the electrical detection method of a kind of three-dimensional differential as claimed in claim 1, it is characterized in that: described emission coefficient comprises generator, signal transmitter, and electric power conductor and electrode etc.; Described receiving system comprises central controller, digital collection station, and electromagnetic probe etc.; Both are synchronous by GPS GPS mode.
3. the electrical detection method of a kind of three-dimensional differential as claimed in claim 1 or 2, it is characterized in that: the electric current of the described multiple waveform that excites be the alternating current that sends by generator through positive and negative square wave of the cycle that the signal transmitter rectification obtains or intermittent square wave etc., marking current intensity is 50～100 peaces.
4. the electrical detection method of a kind of three-dimensional differential as claimed in claim 1 or 2 is characterized in that: described underground power supply used electrode moves from the top down during work, moves multi-point shooting then from bottom to top.
5. the electrical detection method of a kind of three-dimensional differential as claimed in claim 1 or 2, it is characterized in that: it is to be the loop network at center with the well that described ground receives network, 8 to 100 electric field receiving transducers are set on the ring, and end to end, the electric field receiving transducer between ring and the ring interconnects; Described magnetic field receiving transducer adopts 4 to 24 bar magnets to receive field signal, and symmetry is laid on the adapter ring.
6. the electrical detection method of a kind of three-dimensional differential as claimed in claim 1 or 2, it is characterized in that: described processing interpre(ta)tive system is measurement result to be carried out three-dimensional FORWARD AND INVERSE PROBLEMS simulation process obtain underground three-dimensional electrical structure data volume, adopts the section acquisition electrical relative different of different directions of inverting data and the relative electrical property difference of hole diameter direction.
7. as claim 1 or the electrical detection method of 2 or 6 described a kind of three-dimensional differential, it is characterized in that: on ground be the monitoring nets that 4 rings are laid at the center with the well, each ring is gone up and is arranged 24 electric field receiving transducers, have 8 electric field receiving transducers to interconnect between ring and the ring, 8 magnet field probes are arranged symmetrically on the 3rd ring of electric field survey grid; Excite the field source vertical ground, the surface power supply electrode B is fixed near the well head of ground; Underground power supply used electrode A earlier from top to bottom, excites on a plurality of shot points then from bottom to top; Excitation current is a positive and negative square wave of cycle, and strength of current is 80 peaces; The three-dimensional forward simulation of disposal system adopts integral equation method, the generalized inverse inverting is adopted in inverting, sets up underground initial model, by progressively revising model, make ground measured data and Model Calculation match, distribute thereby obtain the underground three-dimensional electrical structure of whole monitoring net.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031209637A CN1532561A (en) | 2003-03-26 | 2003-03-26 | Three-dimensional differential electric detection technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031209637A CN1532561A (en) | 2003-03-26 | 2003-03-26 | Three-dimensional differential electric detection technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1532561A true CN1532561A (en) | 2004-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA031209637A Pending CN1532561A (en) | 2003-03-26 | 2003-03-26 | Three-dimensional differential electric detection technology |
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| CN (1) | CN1532561A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166168A (en) * | 2013-05-17 | 2014-11-26 | 中国石油天然气集团公司 | Method for collecting data of electromagnet excited by well and ground |
| CN109387875A (en) * | 2018-10-25 | 2019-02-26 | 河南理工大学 | A kind of landslide is hydrogeological to monitor geophysical method and device |
-
2003
- 2003-03-26 CN CNA031209637A patent/CN1532561A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166168A (en) * | 2013-05-17 | 2014-11-26 | 中国石油天然气集团公司 | Method for collecting data of electromagnet excited by well and ground |
| CN104166168B (en) * | 2013-05-17 | 2016-10-12 | 中国石油天然气集团公司 | A kind of well excites electromagnetic data acquisition method with integrated ground |
| CN109387875A (en) * | 2018-10-25 | 2019-02-26 | 河南理工大学 | A kind of landslide is hydrogeological to monitor geophysical method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: CHINA NATIONAL PETROLEUM CORP. Free format text: FORMER OWNER: DONGFANG GEOPHYSICAL EXPLORATION CO., LTD., SINOPEC Owner name: DONGFANG GEOPHYSICAL EXPLORATION CO., LTD., SINOP Effective date: 20040910 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20040910 Address after: No. six, Kang 6, Xicheng District, Beijing Applicant after: China National Petroleum Corporation Co-applicant after: Dongfang Geophysical Exploration Co., Ltd., China Petrochemical Corp. Address before: Zhuozhou city of Hebei Province Applicant before: Dongfang Geophysical Exploration Co., Ltd., China Petrochemical Corp. |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |