Configuration cutting method of braided river tight-sandstone gas reservoir layer
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A technology of tight sandstone gas reservoirs and braided rivers, applied in knowledge expression, instrumentation, electrical digital data processing, etc., can solve the problem of low recovery rate of gas fields and achieve significant benefits
Inactive Publication Date: 2017-09-26
PETROCHINA CO LTD
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[0004] In order to overcome the problem of low recovery rate of existing gas fields, the present invention provides a braided river tight sandstone gas reservoir architecture anatomy method, the practical and reliable braided river tight sandstone gas reservoir architecture anatomy method of the present invention
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Embodiment 1
[0038] In order to overcome the problem of low recovery factor of existing gas field, the present invention provides such as figure 1 A braided river tight sandstone gas reservoir architecture anatomy method shown in the present invention is a practical and reliable braided river tight sandstone gas reservoir architecture anatomy method. The present invention improves the recovery rate of this type of gas field, and fine geological research urgently needs to carry out fine anatomical research on the reservoir configuration of braided river tight sandstone gas pools. This method is universal for reservoir architecture dissection, and is suitable for braided river reservoir gas fields with larger well pattern and well spacing than oil wells.
[0039] A method for dissecting the reservoir architecture of braided river tight sandstone gas reservoirs, the specific steps are as follows:
[0040] Step 1: Analyze the sedimentary discontinuities through the data of the braided river r...
Embodiment 2
[0056] Based on the basis of embodiment 1, in the present embodiment, in the step one, the braided river reservoir geological knowledge base includes:
[0057] a. Single channel width, thickness range and shape;
[0058] b. Width, thickness range and shape of braided channels;
[0059] c. Shoal width, length, thickness range and shape.
[0060] The content of the braided river reservoir geological knowledge base described in this step is the prior art, and will not be described in detail in the present invention.
[0061] The sedimentary discontinuities in the step 1 are three types of argillaceous interlayers, calcareous interlayers, or cut-and-stack sandstone electrical curve abrupt changes, wherein the lithology of the argillaceous interlayers is mudstone, silty mudstone, and argillaceous siltstone. Fine-grained material deposits formed due to lacustrine flooding; calcareous interlayers are conglomerate and coarse sandstone, at the end of channel deposition, the sedimenta...
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Abstract
The invention discloses a configuration cutting method of a braided river tight-sandstone gas reservoir layer. The method comprises the steps that a braided-river geologic knowledge library is established; a configuration unit corresponding to a 5-level interface is determined; the boundary of the interwell configuration unit is determined; a 4-level braided-river configuration unit is determined; a well-logging curve cycle method, an identification method of developing positions of a sedimentation layer and a vertical micro-phase change method of a channel bar and a waterway are adopted to determine the position of the channel bar on the panel; well-logging curves are adopted to determine the boundary of a 3-level configuration unit in the channel bar; in the boundary of the 3-level configuration unit, the shape and scale of bryocyte of the channel bar are identified and described, in combination with the analysis of physical properties and gas-bearing properties, effective single sand bodies are quantitatively described, and therefore, a hierarchical description method is formed to accurately describe the configuration of the braided river gas reservoir layer. Through the adoption of the method, the configuration units of different levels of the high-heterogeneity tight-sandstone gas reservoir layer are described, the size and distribution position of the configuration unit of the channel bar are achieved, and therefore a reasonable well-pattern and well-type design of a gas field and fine geological modeling of the three-dimensional reservoir layer are effectively instructed; the well pattern and the well type are optimized, and the recovery rate of the gas field is increased.
Description
technical field [0001] The invention relates to the field of gas field development, in particular to a braided river tight sandstone gas reservoir configuration dissection method. Background technique [0002] The fine characterization technology of oil and gas reservoirs centered on reservoir architecture analysis is a new direction for the development of fine reservoir description in recent years. At present, reservoir architecture analysis mainly uses modern sedimentary observations, field outcrop studies, and indoor tank tests to explore braided reservoirs. Sedimentary model of river sand bodies. The research objects are mostly meandering river point bar sand bodies, which are mainly used in the study of remaining oil distribution in the late stage of oilfield development. Daqing Changyuan Oilfield, Sabei Oilfield, and Hegli Oilfield in the Mughlet Basin of Sudan adopt coring wells and dense well pattern Based on the data, a tentative dissection of the architecture of t...
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