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Determination method of cumulative hydrocarbon generation intensity and identification and evaluation method of dessert layer for clastic rock

A technique for determining hydrocarbon generation intensity and determination method, which is applied in the field of petroleum geological exploration, and can solve problems such as missing and lack of operable methods for shale oil layers, and achieve rapid identification and evaluation, and accurate and reliable identification results

Active Publication Date: 2021-05-25
PETROCHINA CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

The identification method of shale oil layers mainly relies on the inversion of logging information reflecting the parameters of conventional geological elements. There is a lack of an operational method for quantitatively identifying shale oil layers on complex stratigraphic profiles, especially in shale oil layers. In the absence of support from targeted logging series information at the initial stage of oil exploration

Method used

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  • Determination method of cumulative hydrocarbon generation intensity and identification and evaluation method of dessert layer for clastic rock
  • Determination method of cumulative hydrocarbon generation intensity and identification and evaluation method of dessert layer for clastic rock
  • Determination method of cumulative hydrocarbon generation intensity and identification and evaluation method of dessert layer for clastic rock

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Embodiment 1

[0242] This embodiment provides a method for identifying and evaluating a sweet spot layer, and takes Well BNE-1 in an oilfield as an example to illustrate the method for identifying and evaluating a sweet spot layer.

[0243] see image 3 , the method specifically includes the following steps:

[0244] Step 1. Collect geological parameters:

[0245] On the geological section measured in Well BNE-1, the samples at each buried depth of Well BNE-1 (the cuttings were sampled at 5m intervals, all the samples of the shale section were taken, and the sections without samples were taken as sandstone layers by default). Solution analysis (each sample is divided into two parts, one of which is extracted and washed with dichloromethane, and Rock-Eval pyrolysis evaluation analysis and carbon and sulfur element analysis are carried out on the samples before and after oil washing respectively to obtain the basic data of the parameters used) , to obtain thermal maturity parameters, hydrogen...

Embodiment 2

[0306] This embodiment provides a method for identifying and evaluating a sweet spot layer, and takes Well BNE-1 in an oilfield as an example to illustrate the method for identifying and evaluating a sweet spot layer.

[0307] see image 3 , the method specifically includes the following steps:

[0308] Step 1. Collect geological parameters:

[0309] Obtain the well logging curve of BNE-1 well; use the Delta Log R model of Passey (1990) to determine the current organic carbon content and the organic carbon content at the time of initial hydrocarbon generation (that is, when the vitrinite reflectance is 0.5%) at each buried depth ; Among them, the Delta LogR model is:

[0310] TOC=DeltaLogR×10 (2.297-0.1688×LOM)

[0311] Among them, DeltaLogR=lg(RT÷RT_Baseline)-2.5×(RHOB–RHOB_Baseline)

[0312] LOM=0.0989×VR 5 -2.1587×VR 4 +12.392×VR 3 -29.032×VR 2 +32.53×VR-3.0338

[0313] In the formula, RT is the resistivity value of the target buried depth point, in Ω m; RT_Baseli...

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Abstract

The invention provides a determination method of cumulative hydrocarbon generation intensity and an identification and evaluation method of a dessert layer for clastic rock. The determination method of the cumulative hydrocarbon generation intensity comprises the following steps: establishing thermal maturity-hydrogen index templates and thermal maturity-organic carbon loss rate templates of different organic matter types; obtaining pyrolysis parameters of each burial depth point of a target block; determine organic matter type of each burial depth point of the target block based on at least one of the two templates and in combination with the pyrolysis parameters; and determine the cumulative hydrocarbon generation intensity of each burial depth point of the target block based on the organic matter types, the two templates and the pyrolysis parameters. According to the identification and evaluation method of the dessert layer, shale oil dessert layer identification and evaluation are carried out on the basis of the cumulative hydrocarbon generation intensity, threshold oil content of desserts and the maximum oil storage quantity of the rock; and / or non-shale oil dessert layer identification and evaluation are carried out on the basis of the cumulative hydrocarbon generation intensity, the threshold oil content of the desserts, the initial hydrocarbon generation organic carbon content, the clay mineral content, the porosity and the free hydrocarbon content.

Description

technical field [0001] The invention belongs to the technical field of petroleum geological exploration, in particular to a method for determining cumulative hydrocarbon generation intensity in geological research and a method for rapid identification and evaluation of shale oil sweetspots and non-shale oil sweetspots (such as sandstone sweetspots), and is especially suitable for lacustrine fractures. Determination method of cumulative hydrocarbon generation intensity and identification and evaluation of sweet spots in clastic rock basins. Background technique [0002] The shale oil sweet spot refers to the formation in the shale oil potential interval that stores more crude oil than the general muddy source rock, and is easy to achieve industrial development through fracturing, in-situ upgrading and other technical transformation. In the past 10 years, the rapid development of shale gas and shale oil exploration and development technology in the United States and the rapid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B47/00E21B49/00G16C20/70
CPCE21B47/00E21B49/00G16C20/70
Inventor 陈瑞银温志新王兆明贺正军宋成鹏刘小兵刘祚冬陈曦栾天思汪永华边海光
Owner PETROCHINA CO LTD
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