Well Placement Using Closure Stress Based Landing Map

摘要

Desirable completion zones can be identified using closure stress in combination with one or more other attributes such as porosity. One computer-based well placement method includes using the computer to: process a seismic data volume to map the spatial distribution of a seismic-based CSS attribute; acquire logs from one or more boreholes in the subsurface region; derive from the logs a relationship between CSS and a minimum in-situ stress; apply the relationship to the CSS attribute map to produce a landing map that highlights desirable completion zones; and place one or more wells in the desirable completion zones. The borehole logs may include direct measurements of minimum in-situ stress (acquired via microfracture testing), sonic tool measurements of P-wave and S-wave velocity, and density tool measurements of bulk formation density.

主权项

1. A computer-based well placement method that comprises:
(a) accessing a seismic survey of a subsurface region with a computer; (b) processing the seismic survey with the computer to get an attribute map of the subsurface region, wherein the attribute map represents at least a spatial distribution of a seismic-based closure stress scalar (CSS); (c) using the computer to access logs from one or more boreholes in the subsurface region, the logs including at least microfracture testing and sonic logs; (d) deriving from the logs a relationship between a borehole-based CSS and a minimum in-situ stress; (e) applying the relationship to the attribute map with the computer to produce a landing map that highlights desirable completion zones; and (f) using the landing map to place one or more wells in the desirable completion zones.