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• W2020134395 abstract "ABSTRACT This paper presents case studies of pressure buildup analyses in certain oilfields in California producing from the Monterey formation. These miocene formations are thick siliceous and calcareous organic sediments. Production from the Monterey formation dates back to the turn of the century. In recent years additional exploration efforts have resulted in the discovery of new fields in the Monterey formation. Because of the impact that these fields will have on the proved reserves of hydrocarbon in California, improved evaluation techniques are required for these complex lithologies. A review of conventional evaluation methods followed by a discussion and the importance of pressure transient tests are included here. Several case studies on onshore and offshore fields producing from the Monterey shale are presented. INTRODUCTION The Monterey shale is gradually becoming a major producing formation in California. Monterey formation is of the Miocene and Pliocene age and has an extremely complex lithology. Such lithologies require the existence of natural fractures for fluid movement. The production from the Monterey shale dates back to the turn of the century, but the most significant production began near Santa Maria, California, in 1936. Initial wells flowed at rates averaging 2500 B/D with some at rates as high as 10,000 B/D. Fields producing from the fractured Monterey shale extends from Ventura to the north of Santa Maria, onshore and offshore,1 Fig. 1. Santa Maria Valley oilfields have produced 175 MM barrels of oil mostly from the Monterey with estimated reserves of over 63 million barrels. More recently offshore drilling by Exxon in the Santa Ynez Unit and by ARCO in the South Elwood field has resulted in greater reserves in the Monterey shale. Because of the fractured nature of the rock and a great deal of heterogeneities throughout the formation, both in the exploration and the development phases, accurate evaluation techniques are required. While most conventional sandstone type reservoirs may be easily evaluated with the use of well logs, a very comprehensive formation evaluation program must be implemented to delineate the potentially producing intervals in the Monterey formation. The complex nature of rock composition makes the well log interpretation difficult and in many cases ineffective. Oftentimes, extreme borehole conditions preclude the running of geophysical well logs. Pressure transient tests can serve as powerful diagnostic tools in reservoir characterization. In this paper a review of pressure buildup tests available for five wells producing from the Monterey formation is presented. STATEMENT OF THE PROBLEM The bulk of petroleum engineering literature considers producing formations to be homogeneous in every aspect from rock to fluid properties. Studies published on heterogeneous systems have been mostly conducted on fractured carbonate rocks. Reservoirs such as the ones producing from the Monterey shale introduce new problems into the scene. For the treatment of fractured carbonate rocks, the concept of a dual porosity system has been used by evaluation engineers. As such, the rock matrix and the fracture network each have their characteristic porosities and permeabilities. Naturally fractured rocks with no matrix porosity have not been studied in petroleum literature. In geothermal applications, however, reservoirs in metamorphic or igneous rocks may fit this description." @default.
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• W2020134395 date "1981-10-04" @default.
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• W2020134395 title "Pressure Buildup Analysis in a Naturally Fractured Shale Reservoir" @default.
• W2020134395 doi "https://doi.org/10.2118/10183-ms" @default.
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