Nearshore subaqueous fan flood sedimentation unit body width quantitative prediction method

Abstract

The present invention relates to a nearshore subaqueous fan flood sedimentation unit body width quantitative prediction method. The method comprises: clearly defining plane and section distribution features of nearshore subaqueous fan conglomerate sedimentation unit bodies; researching a thickness variation rule of cross sections of vertical central longitudinal sections of the sedimentation unit bodies; determining the widths of the cross sections in different positions; establishing a theoretical formula of vertical width changes of the sedimentation unit bodies and the central longitudinal sections at different distances away from an object source point; by taking the distribution features of the nearshore subaqueous fan conglomerate sedimentation unit bodies determined by a simulation experiment as guidance and taking well-seism combination as a means, performing sedimentation unit body division on an actual geologic body; and on the basis of sedimentation unit body division, determining the boundary thickness of the sedimentation unit bodies, and performing quantitative prediction on the width of a flood sedimentation unit body according to an actual well position condition on each sedimentation unit body. The width changes of the nearshore subaqueous fan flood sedimentation unit bodies at different distances away from the object source can be accurately and effectively determined, so that an exploration boundary is determined, well layout efficiency in the explosion and development process is improved, and production costs in the explosion and development process are reduced.

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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