Changes

* Measure the relative size or height of the fractures, paying particular attention to any rock features that tend to control the vertical extent of the fractures, such as lithology breaks, bedding planes, stylolites, or unconformities.

* Measure the relative size or height of the fractures, paying particular attention to any rock features that tend to control the vertical extent of the fractures, such as lithology breaks, bedding planes, stylolites, or unconformities.

* Observe the width and width variation of the fractures. Measurements of width could be made with a scale, micrometer, or calipers or by impregnation with epoxy or plastic for either thin section measurement of epoxy width or dissolution of matrix leaving the width at the depth approximated.<ref name=pt06r95 />

* Observe the width and width variation of the fractures. Measurements of width could be made with a scale, micrometer, or calipers or by impregnation with epoxy or plastic for either thin section measurement of epoxy width or dissolution of matrix leaving the width at the depth approximated.<ref name=pt06r95 />

* Estimate or measure fracture spacing and its variability with depth.<ref name=pt06r94>Narr, W., Lerche, I. 1984, A method for estimating subsurface fracture density in core: AAPG Bulletin, v. 68, p. 637–648.</ref><ref name=pt06r96>Nolen-Hoeksema, R. C., Howard, J. H., 1987, Estimating drilling direction for optimum production in a fractured reservoir: AAPG Bulletin, v. 71, p. 958–966.</ref>

* Estimate or measure fracture spacing and its variability with depth.<ref name=pt06r94>Narr, W., Lerche, I. 1984, [http://archives.datapages.com/data/bulletns/1984-85/data/pg/0068/0005/0600/0637.htm A method for estimating subsurface fracture density in core]: AAPG Bulletin, v. 68, p. 637–648.</ref><ref name=pt06r96>Nolen-Hoeksema, R. C., Howard, J. H., 1987, [http://archives.datapages.com/data/bulletns/1986-87/data/pg/0071/0008/0950/0958.htm Estimating drilling direction for optimum production in a fractured reservoir]: AAPG Bulletin, v. 71, p. 958–966.</ref>

* Determine principal stress directions and the origin and continuity of the fracture system(s).<ref name=pt06r135 /><ref name=pt06r95 />

* Determine principal stress directions and the origin and continuity of the fracture system(s).<ref name=pt06r135 /><ref name=pt06r95 />

* Determine the relative timing of deformational events from cross-cutting relationships or paragenetic sequence.<ref name=pt06r77>Lindquist, S. J., 1983, Nugget Formation reservoir characteristics affecting production the Overthrust Belt of southwestern Wyoming: Journal of Petroleum Technology, July, p. 1355–1365.</ref>

* Determine the relative timing of deformational events from cross-cutting relationships or paragenetic sequence.<ref name=pt06r77>Lindquist, S. J., 1983, Nugget Formation reservoir characteristics affecting production the Overthrust Belt of southwestern Wyoming: Journal of Petroleum Technology, July, p. 1355–1365.</ref>