A Quantitative Prediction Method for Depositional Unit Width of Nearshore Subaqueous Fan Flood

Abstract

The invention relates to a method for quantitatively predicting the width of a nearshore subaqueous fan flood depositional unit. The invention studies the lateral width of the vertical central longitudinal section of a depositional unit by clarifying the plane and profile distribution characteristics of a nearshore subaqueous fan glutenite depositional unit. The change law of the thickness on the profile, determine the width of the cross section at different positions, establish the theoretical formula of the vertical width change of the sedimentary unit body and the central longitudinal section at different distances from the provenance point, and use the nearshore subaqueous fan sandy conglomerate determined by simulation experiments Guided by the distribution characteristics of sedimentary units, the actual geological body is divided into sedimentary units by means of well-seismic combination; on the basis of the division of sedimentary units, the boundary thickness of sedimentary units is determined, and according to the Quantitatively predict the width of the flood depositional unit based on the actual situation of the upper well position. It can accurately and effectively determine the width change of the nearshore subaqueous fan flood sedimentary unit at different distances from the source, thereby determining the exploration boundary, improving the efficiency of well layout in the process of exploration and development, and saving production costs in the process of exploration and development.

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 quantitatively predicting the width 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 been made in the near...

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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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