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Well spacing method for karst carbonate reservoir

A carbonate rock reservoir and karst technology, which is applied in earth-moving drilling, surface mining, underground mining, etc., to achieve the effect of saving money and reasonable well layout method.

Active Publication Date: 2011-01-05
PETROCHINA CO LTD
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Problems solved by technology

Therefore, the above-mentioned different technologies have professional difficulties and limitations

Method used

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  • Well spacing method for karst carbonate reservoir
  • Well spacing method for karst carbonate reservoir

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Embodiment Construction

[0038] The present invention adopts following mode to implement:

[0039] 1) According to the geological characteristics of karst-type carbonate reservoirs, the upper and lower isochrones should be selected first, and the second isochrone should preferably be selected near the time when the Caledonian tectonic movement ended and the Hercynian tectonic movement began. , choose the Carboniferous limestone top as the superior time surface, Ma Wu 1 4 The bottom is used as the lower isochronic surface to restore the structural form before the Carboniferous deposition at the end of the Caledonian;

[0040] The upper and lower isochrones described in step 1) are respectively the Carboniferous formation limestone top as the upper isochrone, and the Ordovician Ma Wu 1 4 The bottom is the lower waiting time surface.

[0041] In step 1), the thickness of the Carboniferous strata on the upper time plane adopts the decompacted correction value, and the thickness of the Ordovician strat...

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Abstract

The invention relates to natural gas exploitation technology, in particular to a well spacing method for a karst carbonate reservoir. The method comprises the following steps of: selecting an upper isochronous surface and a lower isochronous surface close to end time of caledonian tectogenesis and starting time of Hercynian tectogenesis; reflecting an ancient landform which is high in the west and low in the east and partially develops residual hills and depressions by using a contour diagram; acquiring seismic data; determining a low relief structure form and an evolution process according to inversion section and cross-well seismic data; dividing sedimentary facies of the carbonate reservoir into sedimentary subfacies and sedimentary microfacies; dividing favorable sedimentary microfacies; determining that the reservoir of each well area is communicated by means of yield of the conventional production well and pressure measurement data; and dividing a favorable well spacing area andplacing well at the area with reservoir thickness of more than 20m. The method has the advantages of rational well spacing, measured drilling ratio of well spacing gas reservoir of 100 percent, drilling success rate of 82 percent and capability of obtaining an industrial gas flow from a lower-palaeozoic gas reservoir section and saving capital.

Description

technical field [0001] The invention relates to natural gas exploitation, which integrates earthquake, geology and gas reservoir engineering, and is a method for arranging wells in karst carbonate rock reservoirs. Background technique [0002] There is no mature well deployment technology for karst carbonate reservoirs at home and abroad. Most of the existing well deployment technologies are aimed at structural oil and gas reservoirs. Constrained by established concepts, the treatment of the same phenomenon varies from person to person, and the difference is quite large. [0003] The well deployment technology of structural oil and gas reservoirs is to deploy wells on the confirmed trap structures, because the reservoirs of structural oil and gas reservoirs are mostly developed in blocks, as long as the wells are deployed on the confirmed trap structures. The distribution of karst reservoirs is mainly affected by factors such as karst paleogeomorphology and regional sedimen...

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Application Information

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IPC IPC(8): E21C41/20
Inventor 王勇王东旭李跃刚王彩丽刘海峰唐乐平陈凤喜
Owner PETROCHINA CO LTD
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