阅读说明：本技术 一种密井网条件下快速的井震标定方法 (rapid well seismic calibration method under well pattern tight condition ) 是由 徐立恒 朱权 梁宇 杨会东 李红星 周华建 齐金成 庞春红 于 2019-09-11 设计创作，主要内容包括：本发明涉及一种密井网条件下快速的井震标定方法。主要解决了现有井震标定方法速度慢、密井网条件下会影响后续的开发应用效率的问题。其特征在于：1)均匀选取研究区总井数的1/10-1/4钻井,制作单井深度域合成地震记录；2)调整单井深度域合成地震记录,建立单井处时间和深度的对应关系；3)将单井的地质层位由深度域转为时间域,建立时间域地质层位模型；4)将研究区剩余的钻井层位自动匹配到时间域地质层位模型上,从而实现全部钻井的快速井震标定工作。该井震标定方法,能够在保证井震标定精度的前提下,提高井震标定速度。(the invention relates to a rapid well-seismic calibration method under a dense well pattern condition. The method mainly solves the problems that the prior well-to-seismic calibration method is low in speed and can influence the subsequent development and application efficiency under the condition of a dense well pattern. The method is characterized in that: 1) evenly selecting 1/10-1/4 wells of the total number of wells in the research area, and making single-well depth domain synthetic seismic records; 2) adjusting the single well depth domain synthetic seismic record, and establishing a corresponding relation between time and depth of the single well; 3) converting the geological horizon of the single well from a depth domain to a time domain, and establishing a time domain geological horizon model; 4) and automatically matching the residual drilling horizon of the research area to the time domain geological horizon model, thereby realizing the rapid well-to-seismic calibration work of all drilling wells. The well seismic calibration method can improve the well seismic calibration speed on the premise of ensuring the well seismic calibration precision.)

1. A fast well-seismic calibration method under the condition of a close well pattern comprises the following steps:

1) evenly selecting 1/10-1/4 well drills of the total number of wells in the research area, carrying out actual measurement on the selected well drills to obtain the product of a sound wave velocity well logging curve and a density well logging curve of a depth domain, and making a single well depth domain synthetic seismic record;

2) adjusting the single-well depth domain synthetic seismic record manufactured in the step (1), performing seismic measurement on a research area to obtain three-dimensional seismic data of a time domain, and moving the single-well depth domain synthetic seismic record up and down to enable the waveform of the single-well synthetic record of the depth domain to be matched with the waveform of the time domain seismic data near a well, so that the corresponding relation between the time and the depth of the single well is established;

3) Converting the geological horizon of the single well from the depth domain to the time domain by utilizing the corresponding relation between the time and the depth of the single well established in the step (2), and establishing a time domain geological horizon model by adopting a seismic marker axis constraint interpolation algorithm;

4) and (4) automatically matching the residual drilled well horizons 9/10-3/4 in the research area to the time domain geological horizon model obtained in the step (3), thereby realizing the rapid well-seismic calibration work of all drilled wells.

2. The method for rapid well seismic calibration under the condition of a tight well pattern according to claim 1, characterized in that: and (2) in the step (1), the single-well depth domain synthetic seismic record is obtained by multiplying the acoustic velocity logging curve and the density logging curve to obtain a longitudinal wave impedance curve of the depth domain, and then performing convolution operation on the longitudinal wave impedance curve and the wavelets.

3. The method for rapid well seismic calibration under the condition of a tight well pattern according to claim 1, characterized in that: in the step (3), the time domain geological horizon model is established in a concrete implementation mode by using the time domain horizon of a single well at a well point, and trend constraint is carried out among wells by using a seismic marker axis, so that a space horizon model is established; the specific method comprises the following steps:

Known seismic marker axes and geologic horizons of different wells (A, B, C, D);

Calculating the distance di (i =1,2,3,4) between the geological horizon and the seismic surface;

Interpolating di to obtain dx at any position in the known surface range;

And iv, adding the distance dx to the axial surface of the known seismic mark to obtain the time domain geological horizon model.

4. The method for rapid well seismic calibration under the condition of a tight well pattern according to claim 1, characterized in that: the step (4) is specifically realized by the following steps:

(1) generating synthetic seismic records of 9/10-3/4 remaining boreholes in the study area;

(2) Recording the time value of the corresponding horizon of each well, and calculating to obtain the time difference value delta t between the well horizon and the horizon model;

(3) and automatically moving the synthetic seismic record by a computer according to the size of delta t to correct the well point horizon to the corresponding horizon model, thereby quickly realizing the well seismic calibration work.

Technical Field

The invention relates to the technical field of oil field development, in particular to a rapid well seismic calibration method under a dense well pattern condition.

background

the dense well pattern referred in the patent of the invention refers to that the number of drilled wells is more than 50 holes/square kilometer, and at present, many old oil fields in China, including Daqing oil field, Liaohe oil field, Jilin oil field, etc., all meet the conditions of the dense well pattern. At present, in the field of oil development, the combination of well drilling data and seismic data for oil field development and application becomes a common technology, but because the well drilling data belongs to a depth domain and the seismic data belongs to a time domain, well seismic calibration is required to be carried out in order to classify the well drilling data and the seismic data into the same domain.

The method is characterized in that a single well synthetic seismic record is made, and the single well synthetic seismic record is matched with an actually measured seismic channel beside a well in a coaxial mode by adopting an artificial method. And secondly, the actual measurement seismic marker axis is automatically matched with the geological horizon, the method is low in precision, the correlation between the synthetic record of the well and the seismic waveform is low under the condition of a dense well pattern, and the subsequent development and application effects are influenced.

disclosure of Invention

the invention provides a rapid well-seismic calibration method under the condition of a dense well pattern, aiming at overcoming the problems that the prior well-seismic calibration method in the background art is low in speed and the subsequent development and application effects are influenced due to large workload under the condition of a dense well pattern. The method for rapidly calibrating the well earthquake under the condition of the tight well pattern can improve the calibration speed of the well earthquake on the premise of ensuring the calibration precision of the well earthquake.

the invention can solve the problems by the following technical scheme: a fast well-seismic calibration method under the condition of a close well pattern comprises the following steps:

1) Evenly selecting 1/10-1/4 well drills of the total number of wells in the research area, carrying out actual measurement on the selected well drills to obtain the product of a sound wave velocity well logging curve and a density well logging curve of a depth domain, and making a single well depth domain synthetic seismic record;

2) adjusting the single-well depth domain synthetic seismic record manufactured in the step (1), performing seismic measurement on a research area to obtain three-dimensional seismic data of a time domain, and moving the single-well depth domain synthetic seismic record up and down to enable the waveform of the single-well synthetic record of the depth domain to be matched with the waveform of the time domain seismic data near a well, so that the corresponding relation between the time and the depth of the single well is established;

3) converting the geological horizon of the single well from the depth domain to the time domain by utilizing the corresponding relation between the time and the depth of the single well established in the step (2), and establishing a time domain geological horizon model by adopting a seismic marker axis (the strongest waveform of seismic data and better continuity) constraint interpolation algorithm;

4) and (4) automatically matching (moving) the residual drilled well positions 9/10-3/4 in the research area to the time domain geological position model obtained in the step (3), so that the rapid well-seismic calibration work of all drilled wells is realized.

in the step (1), the single-well depth domain synthetic seismic record is obtained by multiplying the acoustic velocity logging curve and the density logging curve to obtain a longitudinal wave impedance curve of a depth domain, and then performing convolution operation on the longitudinal wave impedance curve and the wavelets;

in the step (3), the time domain geological horizon model is established in a concrete implementation mode by using the time domain horizon of a single well at a well point, and trend constraint is carried out among wells by using a seismic marker axis, so that a space horizon model is established; the specific method comprises the following steps:

Known seismic marker axes and geologic horizons of different wells (A, B, C, D);

calculating the distance di (i =1,2,3,4) between the geological horizon and the seismic surface;

Interpolating di to obtain dx at any position in the known surface range;

and iv, adding the distance dx to the axial surface of the known seismic mark to obtain the time domain geological horizon model.

The step (4) is specifically realized by the following steps:

(1) Generating synthetic seismic records of 9/10-3/4 remaining boreholes in the study area;

(2) recording the time value of the corresponding horizon of each well, and calculating to obtain the time difference value delta t between the well horizon and the horizon model;

(3) and automatically moving the synthetic seismic record by a computer according to the size of delta t to correct the well point horizon to the corresponding horizon model, thereby quickly realizing the well seismic calibration work.

compared with the prior art, the method has the advantages that the method for quickly calibrating the well earthquake under the condition of the dense well pattern can realize quick matching of the well synthetic record and the earthquake waveform under the condition of the dense well pattern, the speed is improved by 4 ~ 10 times, the effect of well earthquake combined development and application is ensured, and the method is of great significance for ensuring stable production of the oil field.

description of the drawings:

FIG. 1 is a flow chart of the method for fast well seismic calibration of a tight well pattern according to the invention;

FIG. 2 is a diagram of the single well synthetic seismic record making and calibration with the well-side seismic traces in the example;

FIG. 3 is a schematic diagram of a time domain geological horizon model established by a seismic marker axis constrained interpolation algorithm in the embodiment;

FIG. 4 is an example time domain geological horizon model;

FIG. 5 is a matching graph of well horizons and horizon models for the 9/10 scale well numbers in an example.

The specific implementation mode is as follows:

The invention will be further described with reference to the following drawings and specific embodiments: