Calculation method of interlayer parameters in distributary sand bar based on well trajectory

Abstract

A calculation method of interlayer parameters inside a distributary bar based on well trajectory: Under the guidance of the sedimentary model of the distributary bar type shallow water delta, various attributes sensitive to the boundaries of a single distributary bar are extracted through seismic forward modeling and fused. Attributes qualitatively describe the plane distribution of single distributary sand bars. At the same time, taking the seismic low-angle foreslot as the starting point, the theoretical calculation model of the foresegment is established to quantitatively calculate the boundary of a single distributary sand bar. In a single distributary sand bar, the theoretical calculation model of interlayer parameters inside the distributary sand bar is established according to the contact relationship between the trajectory of the directional well and the horizontal well and the interlayer, and the relevant geological parameters are extracted from the data of the wells drilled in the interlayer, and the final quantitative calculation of the distributary sand is carried out. The inclination, spacing and thickness of the interlayer inside the dam. The invention makes full use of the well trajectory information, establishes the quantitative relationship between the well trajectory information and the geological body, reproduces the distribution of interlayers inside a single distributary sand bar, and makes the depiction result more accurate and reliable.

Description

technical field [0001] The invention relates to a method for calculating interlayer parameters inside a diversion sand bar. In particular, it relates to a calculation method of interlayer parameters inside a distributary sand bar based on well trajectory. Background technique [0002] Different from normal deltas, shallow-water deltas, as a special sedimentary type, develop in depressed lake basins with shallow water bodies, relatively gentle structures, and slow overall subsidence. According to the difference in sedimentary framework, they can be divided into distributary channel type and distributary sand. Dam type. In recent years, as modern sedimentary observation and flume sedimentary simulation have been widely used in the study of shallow water delta reservoirs, the understanding of distributary bar type shallow water deltas has also been further deepened. [0003] At present, for the internal interlayer of single distributary sand bar in shallow water delta of dist...

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