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A method for identification and description of deep carbonate karst structures

A carbonate rock and identification method technology, applied in seismology, seismology, instruments and other directions for logging records, can solve problems such as difficulty, unrepresentation, and possibility, and improve accuracy , the effect of improving the accuracy

Active Publication Date: 2022-07-29
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Application Information

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Problems solved by technology

However, the cost of drilling and coring in deep carbonate rocks is relatively high. From the perspective of production, it is unlikely to take coring from the entire well section, especially when the pressure is released when drilling into a karst cave, and it is difficult to drill and coring. There are cores of different well sections, affected by the rate of coring and homing accuracy, it is not representative to use cores to reflect the overall characteristics of the formation

Method used

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  • A method for identification and description of deep carbonate karst structures
  • A method for identification and description of deep carbonate karst structures
  • A method for identification and description of deep carbonate karst structures

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Embodiment

[0048] Please refer to figure 1 , the present embodiment provides a method for identifying a deep carbonate karst structure, comprising the following steps:

[0049] S1: Identify karst-developed intervals through seismic profiles

[0050] Generally speaking, caves with a height of 0.5-5m have no obvious abnormality in earthquakes and drilling, and caves with a height of more than 5m can be displayed in 3D seismic data. Use Landmark software to interpret typical seismic profiles in the study area. Due to the limitation of seismic resolution, the longitudinally drilled karst caves cannot show their completed external shape on the seismic profile, but are typical beading or horizontal strong reflection characteristics This is also the main seismic identification feature of large epigenetic karst caves. Through the mutual calibration of logging curves and seismic profiles, the specific depth of the karst development section can be obtained;

[0051] S2: Obtain the imaging loggin...

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Abstract

The invention discloses a method for identifying and describing a deep carbonate rock karst structure, comprising the following steps: identifying the karst development part of a target interval at a well point in a target area; interpreting imaging logging images to determine that the karst structure is in the target interval The specific depth range of development; identify the characteristics of each component unit of the karst structure, including core characteristics, imaging log image characteristics and response characteristics of conventional logging curves. The method for identifying and describing the karst structure of the deep carbonate rock of the present invention adopts the combination of the core, the imaging logging image and the natural gamma curve, and can more accurately identify the type of the karst structure unit of the deep carbonate rock.

Description

technical field [0001] The invention relates to the technical field of carbonate rock karst detection, in particular to a method for identifying and describing a deep carbonate rock karst structure. Background technique [0002] Fine analysis of karst structure and research on complex karst genetic mechanism are the focus of geologists at home and abroad, and it is also one of the hot issues that need to be solved urgently in carbonate oil and gas exploration. A large number of scholars have carried out research on the general characteristics and formation and evolution of carbonate karsts based on field outcrop data and oilfield underground data. At present, the understanding of karst macrostructure is not clear enough. The scientific and systematic characterization of the karst structural characteristics of deep carbonate rocks is an important basis for revealing the genetic mechanism of deep carbonate rocks. [0003] Imaging logging is a logging technology that has emerg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/40
CPCG01V1/301G01V1/306G01V1/40G01V2210/612G01V2210/6161G01V2210/6244G01V2210/624G01V2210/74
Inventor 耿晓洁林畅松李浩
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)