Karsting appears to have occurred in multiple episodes as the sea level rose and fell. Caliche zones are evident in several cores, and samples often indicate fairly major periods of weathering occurred. This led to compartmentalized reservoirs of varying lateral and vertical extent.
Significant fracturing occurred as a result of subsidence and differential compaction. Fracturing created fluid migration pathways throughout the reef.
Evidence in cores suggests considerable primary and secondary porosity was destroyed by post depositional fluid migration. Vadose deposition occurred throughout the manolo blahnik store building process, creating large cavities where sediment infill occurred. ,
louboutin heels; Secondary calcite healed fractures and filled pore spaces.
The upper 100 ft of the christian shoe has some of the best preserved primary porosity. This could largely be due to the growth of the frame building organisms during the late Silurian and into the early Devonian being truncated by the regressing Devonian seas. A period of non-deposition occurred during early to middle Devonian. The original matrix porosity was not as adversely affected and secondary porosity was enhanced during this period.
Lithologic correlations are difficult in a
louboutin boot environment without the aid of detailed studies. Although core studies are helpful in understanding localized vertical stratigraphy, lateral changes occur so rapidly that the horizontal resolution is almost limited to core diameter.
Because lateral variations are so significant, production data have been used as an aid in understanding the geologic complexities. Correlations made using logs,
office shoes, cores, and samples re highly interpretive. When supported by well production history data, verification of expected reservoir continuity or discontinuity can often be confirmed.
Cores were taken on all pre-1984 wells. Generally, fossil assemblages were described in limited detail, so meaningful lithologic correlation is difficult using this information. The main objective in coring wells during original field development was to aid in making pipe setting decisions.
Recent development has been done without cores. Sample analysis identifies general lithologic changes, although detailed analysis can only be made from cores. Fossil assemblages are difficult to identify in samples, making recognition possible only to those highly skilled in analysis. Samples are collected and evaluated every 10 ft through the reef. A sample log is prepared indicating general lithologic descriptions, drilling time, fluorescence, and cut.
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