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Evaluation method and device for dominant segment cluster of sweet heart segment of fine-grained rock oil and gas reservoir

A rock oil and gas sweet spot technology, which is applied in the evaluation field of fine-grained rock oil and gas reservoir sweet spot segment clusters, can solve the problems of high fracturing cost and low fracture initiation efficiency of perforation clusters, so as to reduce fracturing cost and improve fracture initiation rate. Fracturing efficiency and the effect of increasing single well production

Active Publication Date: 2019-11-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, major breakthroughs have been made in the oil exploration of fine-grained sedimentary rocks. In the development process, the fracturing scheme for fine-grained sedimentary rock sections is generally used as uniform fracturing. higher cost

Method used

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  • Evaluation method and device for dominant segment cluster of sweet heart segment of fine-grained rock oil and gas reservoir
  • Evaluation method and device for dominant segment cluster of sweet heart segment of fine-grained rock oil and gas reservoir
  • Evaluation method and device for dominant segment cluster of sweet heart segment of fine-grained rock oil and gas reservoir

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Embodiment 1

[0032] Such as figure 1 As shown, it is a schematic flow chart of an evaluation method for sweet spot segment clusters of fine-grained rock oil and gas reservoirs provided by the embodiment of the present invention. figure 1 Visible, this method comprises the following steps:

[0033] Step S102: Obtain the core data and logging data of the coring well in the target area, as well as the logging data of the well to be evaluated; the core data includes the lithology of the core, and the organic carbon content and vitrinite reflection of each lithology rate, hydrocarbon generation potential, porosity and mineral content.

[0034] Here, both the coring well and the well to be evaluated belong to the same target area. Among them, coring wells are mainly used to drill underground cores for observation, identification, and analysis of samples for experiments, so as to directly obtain various data or parameters related to stratum lithology, lithofacies, physical properties, oil-gener...

Embodiment 2

[0083] In order to better understand the evaluation method for the above-mentioned sweet-sweet section dominant section clusters of fine-grained rock reservoirs, this embodiment uses an application example to illustrate. Among them, in this embodiment, the above-mentioned evaluation method is used to design a fracturing scheme for the horizontal section of the fine-grained sedimentary rock reservoir in well GD1701H in a certain block, and the specific steps are as follows.

[0084] 1) Determine the lithology of fine-grained sedimentary rocks through the combined test and analysis results of cores from core wells, carry out evaluation of source rocks, reservoirs and brittleness for different lithologies, and determine the dominant lithofacies through comprehensive evaluation results.

[0085] ①Lithology judgment.

[0086] X-ray diffraction analysis shows that the fine-grained sedimentary rock minerals of the second member of the hole in this area are mainly composed of seven ma...

Embodiment 3

[0115] The embodiment of the present invention also provides an evaluation device for clusters of dominant segments in sweet spots of fine-grained rock reservoirs, such as Image 6 Shown, which is a schematic diagram of the structure of the device, by Image 6 It can be seen that the device includes sequentially connected data acquisition module 61, sweet spot quality acquisition module 62, lithology and logging data correspondence determination module 63, lithology interpretation data determination module 64, comprehensive sweet spot quality calculation module 65 and dominant segment cluster determination Module 66, wherein the functions of each module are as follows:

[0116] The data acquisition module 61 is used to acquire the core data and logging data of the coring well in the target area, and the logging data of the well to be evaluated; the core data includes the lithology of the core, and the organic carbon content of each lithology, Vitrinite reflectance, hydrocarbon ...

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Abstract

The invention provides an evaluation method and device for a dominant segment cluster of a sweet heart segment of a fine-grained rock oil and gas reservoir. Firstly, core data and logging data of a cored well in a target area and logging data of a to-be-evaluated well are acquired; the sweet heart quality of each kind of lithology is calculated; then, according to the logging data of the cored well and the lithology of a core, a corresponding relationship between each kind of lithology and the logging data is determined; then, according to the logging data of the to-be-evaluated well and the corresponding relationship, lithology interpreting data of the to-be-evaluated well is determined; secondly, according to the lithology interpreting data and the sweet heart quality of the lithology, comprehensive sweet heart quality of a preset stratum segment corresponding to each depth point of the to-be-evaluated well is calculated; according to the comprehensive sweet heart quality of the preset stratum segment, the dominant segment cluster of the sweet heart segment of the to-be-evaluated well is accordingly determined. The method has the advantages that by screening the dominant segmentcluster of the sweet heart segment out from the to-be-evaluated well, the cracking efficiency of perforation clusters can be improved, the fracturing cost is reduced, and the yield of single well is increased.

Description

technical field [0001] The invention relates to the technical field of oil and gas development, in particular to an evaluation method and device for clusters of dominant segments in sweet spots of fine-grained rock oil and gas reservoirs. Background technique [0002] Different from tight oil and shale oil, tight oil mainly includes tight sandstone oil and tight limestone oil. The lithology in the sweet spots of tight oil is uniform, and the oil-bearing property is gradually changing. Lithological organic matter abundance varies widely, and pore types are diverse, with the characteristics of self-generation and self-storage in situ residual accumulation or short-distance migration-accumulation accumulation, and lithology has an obvious control effect on the sweet spots of fine-grained sedimentary rock reservoirs. [0003] At present, major breakthroughs have been made in the oil exploration of fine-grained sedimentary rocks. In the development process, the fracturing scheme ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V9/00G01N33/24G01N15/08
CPCG01N15/088G01N33/24G01N33/241G01V9/007
Inventor 周立宏陈长伟杨飞
Owner PETROCHINA CO LTD
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