A kind of ancient landform restoration method

A technology for paleogeomorphology recovery and paleogeomorphology, applied in the direction of instruments, image data processing, and analysis materials, can solve problems such as inaccurate reflection of karst conditions, and achieve the effect of restoring paleogeomorphology and promoting paleogeomorphology restoration

Active Publication Date: 2021-07-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] It can be seen that the key to paleogeomorphological restoration using the residual thickness method and the impression method is to determine the base level for thickness estimation, that is, to find a near-horizontal isochronous sequence boundary in a region, but both base levels have limitations , the base level of the residual thickness method more reflects the pre-karst sedimentary period, while the base level of the fill-up method reflects the post-karst sedimentary cover, neither of which can accurately reflect the state of karst
At the same time, due to the limitations of the application premise of these two methods, the use of these two different methods in the same area may even produce diametrically opposite results such as karst depressions and karst highlands.

Method used

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  • A kind of ancient landform restoration method
  • A kind of ancient landform restoration method
  • A kind of ancient landform restoration method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Applying the identification method of karst breccia given in step S1 to the Fuxian block to identify Lower Paleozoic Ordovician karst breccia, especially accumulative breccia, has very good application effect.

[0085] The average GR value of the surrounding rock in the Fuxian block is 60API, a1 is 70API, a2 is 100API, the average resistivity C of the surrounding rock is 665Ω.m, c1 is 400Ω.m, and c2 is 150Ω.m. s1=1.1, s2=1.4.

[0086] Well Fugu 7 ranges from 2959.5m to 2963.0m, in which the GR value is very low, ranging from 9.7 to 18.3API, with an average value of 26.4API, and the curve is straight, lower than the average value A. The resistivity is relatively low, between 559 and 3499Ω.m, roughly bow-shaped, and there is a certain difference in the depth and shallow resistivity. The average LLS of the shallow lateral resistivity is 802.8Ω.m, and the average value of the deep lateral resistivity LLD is 1170.1Ω. .m, all greater than the C value, and the LLD / LLS mean va...

Embodiment 2

[0101] Ordovician karst reservoirs in Sinopec FX area are affected by paleogeomorphology. In the restoration process of paleogeomorphology in the FX area, the residual thickness method and the impression method were applied respectively. The two methods found that the paleogeomorphology features in the northeast of the block were similar, but the southwestern part showed a huge difference in thickness due to structural features as the main controlling factor: The model method is considered to be the high part of the karst, but the residual thickness method draws the conclusion of the low part of the karst. These two completely different conclusions directly affect the judgment of paleogeomorphology.

[0102] Therefore, in the research process, we adopted the technology described in the present invention, first identified the water surface of a single well, then flattened the lowest water surface, and carried out paleogeomorphological depiction, and finally obtained the karst h...

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Abstract

The invention relates to a paleogeomorphological recovery method, which comprises: S1 dividing breccia into karst broken breccia, karst collapsed breccia and karst accumulative breccia according to different origins, and identifying the breccia by establishing a karst breccia identification pattern Karst breccia in the whole well section of the target layer; S2 marks the positions of karst accumulation breccia and karst collapse breccia in the whole well section, and marks the lowest position marked in each well as the position of the lowest water table And determine the lowest water surface of the whole well section; mark the position of the unconformity surface of each well and determine the unconformity surface of the whole well section; Geomorphic drilling analysis profile, flatten the karst paleogeomorphology drilling analysis profile with the lowest water level of the whole well section as the reference level, and draw the karst paleotopographic profile; S4 marks the relative elevation value of each well on the karst paleotopographic profile, and then Contour maps are drawn for the data, and the contour maps are paleogeomorphological maps.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration and development, in particular to a method for restoring paleogeomorphology. Background technique [0002] Karst reservoirs are the most important type of carbonate reservoirs, and the development of reservoirs is obviously controlled by paleogeomorphology. Therefore, it is essential to study the restoration of paleogeomorphology in karst reservoirs. Paleogeomorphology restoration is to study the concave-convex state of the interface surface represented by the isobath line on a certain interface in a certain period. With the continuous advancement of technology, the restoration technology of karst paleogeomorphology has also made great progress, and the research methods have become more and more diverse. These methods are based on the two basic methods of residual thickness method and impression method. [0003] The so-called residual thickness method refers to the most direct meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T17/05G01N27/04
CPCG01N27/041G06T17/05
Inventor 张军涛何治亮金晓辉王丹丹孙宜朴孟庆强陈霞李淑筠
Owner CHINA PETROLEUM & CHEM CORP
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