Method utilizing lithological combination identification sedimentary facies

A technology of lithologic combination and sedimentary facies, applied in seismology, earthwork drilling, wellbore/well components, etc. for logging records, which can solve the problem of long research cycle, heavy workload, and evaluation methods that are dependent on researchers. And other issues

Active Publication Date: 2017-07-28
PETROCHINA CO LTD
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Problems solved by technology

Sedimentary facies identification can be comprehensively judged by field outcrop, core, logging and seismic data, but its evaluation method often relies too much on the research experience of

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  • Method utilizing lithological combination identification sedimentary facies
  • Method utilizing lithological combination identification sedimentary facies
  • Method utilizing lithological combination identification sedimentary facies

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[0044] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0045] The material composition of the terrigenous clastic sedimentary system of continental lacustrine basins is mainly sand, silt, clay and other clastic materials. Dynamics, sedimentary characteristics, and other depositional conditions can divide terrigenous clastic sedimentary systems into alluvial fan systems, alluvial fan systems, fluvial systems, delta systems, braided river delta systems, fan delta systems, gravity flow systems, and lacustrine systems , each sedimentary system contains several sedimentary facies combinations and sedimentary facies, as shown in Table 1.

[0046] Table 1 Depositional system of continental clastic rocks

[0047]

[0048]

[0049] By extracting the lithological characteris...

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Abstract

The invention relates to a method utilizing lithological combination identification sedimentary facies. The method comprises the following steps that S1, the lithological combination index of a study layer section is collected and processed; S2, the depositional environment is judged utilizing the mudstone color index; S3, sedimentary facies belt is judged utilizing the mudstone thickness index; S4, the material source stability is judged utilizing the sandstone thickness disparity; S5, the study layer section lithology is judged utilizing the lithology index; S6, the hydrodynamic strength is judged utilizing the sandstone grain size index; S7, the grain size variation is judged utilizing the sandstone grain size variation index; S8, the material source stability is judged utilizing the sandstone thickness index; S9, the ranges of the sedimentary facies form step S2 to step S8 is reduced step by step according to the study layer lithological combination index, so that the sedimentary facies is judged; and the step S2 to step S8 are not sequential.

Description

technical field [0001] The invention relates to the technical field of mineral oil and gas resource exploration, in particular to a method for identifying sedimentary facies by using lithological combinations. Background technique [0002] Sedimentary facies is the overall picture of a certain part of the earth's surface in a certain geological period, and it is a synthesis of the characteristics of the sedimentary environment and the sedimentary rocks (objects) formed in this environment. Oil and gas exploration can infer the horizontal type and series of adjacent areas according to the sedimentary facies sequences that appear vertically, and provide a basis for selecting powerful target areas. Sedimentary facies identification can be comprehensively judged by field outcrop, core, logging and seismic data, but its evaluation method often relies too much on the research experience of researchers, which belongs to qualitative analysis, and the research period is too long, mak...

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Application Information

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IPC IPC(8): E21B49/00G01V1/40
CPCE21B49/00G01V1/40
Inventor 周立宏蒲秀刚陈长伟肖敦清姜文亚杨飞朱桂娟韩文中张伟时战楠侯秀川林常梅
Owner PETROCHINA CO LTD
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