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Clastic rock sedimentary microfacies discrimination method

A sedimentary microfacies and discrimination method technology, applied in the field of petroleum exploration, can solve the problems of small vertical and horizontal resolution, difficult logging data comparison, rough research results, etc., and achieve the effect of improving geological resolution

Inactive Publication Date: 2017-12-19
DAGANG OIL FIELD OF CNPC
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Problems solved by technology

These genetic markers are the result of hydrodynamic factors in various sedimentary environments. Therefore, the conventional single use of seismic, logging and core data for sedimentary microfacies analysis has certain limitations. Carrying out regional research has great advantages, but because its vertical and horizontal resolution is smaller than that of the target body, the research results are relatively rough; 2) It is difficult to compare wells in the short-term cycle of logging data; 3) The sedimentary structure described in the core data May occur in different sedimentary microfacies, increasing uncertainty

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  • Clastic rock sedimentary microfacies discrimination method
  • Clastic rock sedimentary microfacies discrimination method
  • Clastic rock sedimentary microfacies discrimination method

Examples

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Embodiment 1

[0112] 1) Using seismic data to determine the formation reflection type;

[0113] The dominant frequency of the seismic profile corresponding to the strata below the sand in Well A is 45Hz. Such as Figure 4 As shown, on the seismic profile, this layer can be subdivided into three small layers ①, ②, and ③, whose amplitudes are 1.5 seismic traces, 0.5 seismic traces, and 0.8 seismic traces respectively, and the amplitude continuity is 1.3 stacking segment and 0.25 stacking segment and 0.4 superimposed segment. From bottom to top, the seismic reflection is characterized by high-amplitude medium-frequency high connection (C6), medium-amplitude medium-frequency discontinuity (B4), medium-amplitude medium-frequency medium continuous (B5), and it is an upwardly weakened seismic reflection structure. It can be preliminarily interpreted as retrogradational delta, retrogradational fan delta, retrogradational braided river delta depositional system or far-shore subaqueous fan depositi...

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Abstract

The invention discloses a clastic rock sedimentary microfacies discrimination method. The method comprises steps that seismic data is utilized to determine a stratum reflection structure; a natural potential curve is utilized to calculate a logging curve form; rock core data is utilized to analyze bedding structures; flake data is utilized to determine a granularity combination form; and sedimentary microfacies is discriminated through comprehensively utilizing the seismic, logging, rock core and flake information. The method is advantaged in that geological resolution is improved step by step from a macroscopic mode to a microscopic mode, limitations of single data in the sedimentary microfacies discrimination process are made up, sedimentary microfacies can be more accurately discriminated, and technical support is provided for oil and gas exploration and development.

Description

technical field [0001] The invention relates to a discrimination method, in particular to a clastic sedimentary microfacies discrimination method, which belongs to the technical field of petroleum exploration. Background technique [0002] Sedimentary microfacies refers to the smallest unit with unique rock structure, structure, thickness, rhythm and other sedimentary characteristics on the profile and certain plane configuration rules within the scope of the subfacies zone. With the deepening of exploration, the identification of sedimentary microfacies has become one of the key steps in the exploration of lithologic reservoirs. When distinguishing sedimentary microfacies, lithology, grain size, sorting, mud content, vertical sequence, shape and distribution of sand bodies are all important genetic indicators. These genetic markers are the result of hydrodynamic factors in various sedimentary environments. Therefore, the conventional single use of seismic, logging and core...

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Application Information

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IPC IPC(8): G01V11/00
CPCG01V11/00
Inventor 赵贤正蒲秀刚周立宏金凤鸣肖敦清时战楠韩文中姜文亚张伟杨飞
Owner DAGANG OIL FIELD OF CNPC
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