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By Michael Ashton, Geological Society of London

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As feldspar was removed, many of the lithic fragments were crushed. This process led to a net reduction in primary porosity and deterioration of reservoir properties. The early chlorite grain coats (Fig. 16), which inhibited quartz cementation, helped preserve a friable and compactible rock fabric. Although average porosity declines from 18 to 9% from well Q05 and Q04, the volume of quartz cement is constant at about 1-2% (Table 3), supporting the conclusion that compaction, not cementation, is the primary cause of porosity loss.

Both factors contributed to the relative sea-level rise and the accommodation development. This also accounts for the thicknesses of the individual TR and HS systems tracts seen in the synthetic cross-section (Fig. 12) as well as the cross-section based on well data (Fig. 13). 2 together induced a large net sea-level rise within the LZA 3 supercycle which left a large accommodation potential on the shelf, and thick sequences could develop. 3 no net rise in eustatic sea-level is achieved (see Fig.

NW • Zechstein-Undiff. ~----~ Carboniferous- Undiff. j~ (3as Well Abandoned ~_ ] cas Shows ( ) Gas Well L500 Fig. 3. NW-SE cross-section through the Vanguard Field demonstrating the structure and the location of the gas-water contact (GWC). The purpose of this paper is to document intrawell and interwell heterogeneity in the Vanguard Field and to examine the causes for that heterogeneity and the associated variable productivity. , early water production). An understanding of the causes for interwell productivity variations can contribute to the design of field-scale 36 R.

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