Quantitative prediction method for maximum extension distance of nearshore subaqueous fan flood sedimentary unit

Abstract

The invention relates to a maximum extension distance quantified prediction method of a near-shore underwater fan flood sedimentation unit body. Based on a near-shore underwater fan sedimentation formation mechanism and a water tank sedimentation simulation experiment, plane and profile distribution characteristics of a near-shore underwater fan glutenite sedimentation unit body are determined, the longitudinal change rule of the thickness of the flood sedimentation unit body is researched, and a theoretical formula model of the thickness change of a central longitudinal profile of the flood sedimentation unit body is established; with the guidance of the distribution characteristics, determined by the simulation experiment, of the near-shore underwater fan glutenite sedimentation unit body, a practical geological body is divided into sedimentation unit bodies by means of well-seismic combination; and based on sedimentation unit body division, the boundary thicknesses of the flood sedimentation unit bodies are determined, and according to the practical well location condition on each sedimentation unit body, the maximum extension distances of the flood sedimentation unit bodies are predicted. According to the invention, the maximum extension distance of the near-shore underwater fan flood sedimentation unit body can be accurately and effectively determined, the sedimentation of a well network and the making of an exploration development scheme are effectively guided, and the well spacing efficiency in the exploration development process is improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploration and development, and in particular relates to a method for quantifying and predicting the maximum extension distance of a nearshore subaqueous fan flood deposition unit. Background technique [0002] The nearshore subaqueous fan in the steep slope zone of the faulted lake basin refers to various depositional processes such as episodic activities of basin-controlling faults and climate-controlled debris flows, paroxysmal mountain floods, and mountain rivers during flood intervals during the period of lake transgression and high water level Deep-water conglomerate fans distributed close to faults formed by sedimentation. The near-shore subaqueous fan glutenite body in the steep slope of the faulted lake basin is closely adjacent to the deep lacustrine source rock, and has an excellent source-reservoir-cap matching relationship. In recent years, major breakthroughs have...

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Problems solved by technology

However, high-resolution sequence stratigraphy has good guiding significance for the identification of gradual traction flow sedimentary units, and for the division of nearshore subaqueous fan glutenite sedimentary units controlled by irregular event gravity flow spin-cycle deposition Lack of effective guidance

[0005] Secondly, the spatial distribution and scale of the nearshore subaqueous fan flood sedimentary units are unclear

For nearshore subaqueous fan glutenite, the flood sedimentary unit has the best storage performance, and is the main part of its production and development. In the case of glutenite sedimentary unit developed in the work area, there is currently a lack of an effective and accurate In this way, it will bring great difficulties to the accurate evaluation of resources and the precise deployment of well locations. In this case, it is necessary to drill some wells within a possible range to find sediments. The boundary of the unit cell brings a lot of economic consumption

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