Geology Studies

Five types of important sedimentary rocks from the production of hydrocarbons. Sandstones Sandstones are clastic sedimentary rocks composed of mainly sand size particles or grains set in a matrix of silt or clay and more or less firmly united by a cementing material (commonly silica, iron oxide, or calcium carbonate). The sand particles usually consist of quartz, and the term “sandstone”, when used without qualification, indicates a rock containing about 85-90% quartz. Sandstone is good reservoir rock. Carbonates, broken into two categories , limestones and dolomites. Carbonates are sediments formed by a mineral compound characterized by a fundamental anionic structure of CO3-2. Calcite and aragonite CaCO3, are examples of carbonates. Limestones are sedimentary rocks consisting chiefly of the mineral calcite (calcium carbonate, CaCO3), with or without magnesium carbonate. Limestones are the most important and widely distributed of the carbonate rocks. Dolomite is ...

THE PROPERTIES OF RESERVOIR ROCKS According to Society of Petroleum Engineers Glossary, a reservoir rock is a rock containing porosity, permeability, sufficient hydrocarbon accumulation and a sealing mechanism to form a reservoir from which commercial flows of hydrocarbons can be produced. Porosity and permeability are the reservoir rock most significant physical properties.  A fundamental property of a reservoir rock between them is porosity. However, for explorationists, an effective reservoir rock, the most fundamental reservoir rock property is its permeability. Both of them are geometric properties are the result of its lithological, structural and compositional behaviour (composition). These physical compositions of a rock and the textural properties are geometric such as sizes and shapes of the rock grains, their arrangement system and packaging. The efficiency of reservoir rock account on different important properties. The reservoir content is estimated by means studyi...