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Gold Science and Technology ›› 2021, Vol. 29 ›› Issue (3): 345-354.doi: 10.11872/j.issn.1005-2518.2021.03.189

• Mineral Exploration and Resource Evaluation • Previous Articles    

Automatic Construction Method of Constraint Rules for Implicit Modeling of Geological Bodies Based on Borehole Data

Bo WANG(),Kang HE,Deyun ZHONG()   

  1. School of Resources and Safety Engineering，Central South University，Changsha 410083，Hunan，China
  • Received:2020-10-24 Revised:2021-01-11 Online:2021-06-30 Published:2021-07-14
  • Contact: Deyun ZHONG E-mail:wangbo_lingli@163.com;deyizhiyun@163.com

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Abstract:

Three-dimensional geological modeling can be divided into traditional wireframe modeling and implicit modeling.Compared with traditional wireframe modeling，implicit modeling method does not require a large number of human-computer interactions，and has the advantages of high model quality，repeatable process and fast local dynamic update speed.After years of research，various interpolation methods for implicit modeling have been developed，but the constraint data required for implicit modeling interpolation requires a lot of preprocessing，for a wide range of geological modeling work，manual processing of interpolation constraint data requires a lot of time and energy for geologists，and the operation of geological modeling based on manual processing is semi-automatic implicit modeling.In order to improve the automation degree of geologic body implicit modeling method，we proposed a method of automatic extraction and quantification of formation characteristic parameters based on borehole data，which can take into account the global occurrence characteristics of stratum and the local occurrence trend of borehole，and be used to construct interpolation constraints that control the geometry of different geological interfaces.This method analyzes the original geological drilling data，automatically extracts the occurrence of the formation to characterize the global interpolation trend of the formation，and then uses the local ellipsoid search to construct the neighborhood drilling group，extracts the field boundary point set according to different search strategies，and finally calculates the local occurrence parameters to construct local interpolation trends.Based on the above ideas，combined with the implicit modeling method of geological bodies considering the constraints of stratigraphic sequence，a complete geological body model that conforms to stratigraphic characteristics and satisfies the laws of stratigraphic sequence was constructed.The data extracted by this method were used to construct a single geological model of a uranium deposit in Xinjiang using the potential field method and the HRBF method，after that，a comprehensive model of complex shapes was constructed with full consideration of the constraints of geological rules.Comparison of the geometric form of a single model built by the two interpolation methods and the comparison of the exploration line profile of the overall model，the research results show that the new method takes into account the geological rules and constraints，can simulate sedimentary strata and intrusions strata well，and the model has good accuracy and conforms to the cognitive rules of geologists.

Key words: implicit modeling, borehole data, geological modeling, geological rule constraint, formation characteristic parameters, local ellipsoid

CLC Number: 

  • TD67

Fig.1

Relationship diagram of gradient data and azimuth information"

Fig.2

Automatic construction process of geological rule constraints"

Fig.3

Projection diagram of original borehole point data set"

Fig.4

Schematic diagram of neighborhood borehole group"

Fig.5

Schematic diagram of feature point set extraction"

Fig.6

Calculation of local occurrence parameters"

Fig.7

Borehole data and boundary point set diagram"

Fig.8

Superposition display effect diagram of potential field method and HRBF method"

Fig.9

Solution technology roadmap of Gempy complex geological model"

Table 1

Sequence law and sequence relationship of strata"

地层序列地层层序序列关系地层属性
细砂岩层8Erode侵入体
泥岩层7Erode侵入体
粗砂岩层6Erode侵入体
中砂岩层5Erode侵入体
顶层4Onlap沉积层
煤层3Onlap沉积层
砂泥混合层2Onlap沉积层
基岩1Onlap沉积层

Fig.10

Effect diagram of 3D geological surface model"

Fig.11

Section diagram of 3D geological model"

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