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The document defines various types of sedimentary rocks through their composition and formation processes, including sandstone formed from quartz and feldspar grains, limestone formed from calcite and shells, and shale formed from compacted clay. It also describes processes like compaction, cementation, and erosion that form sedimentary rocks from sediments over time, often preserving fossils.
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Total (absolute) Porosity and Isolated Porosity Measurement
Absolute porosity is the percentage or volume of void spaces or porosity of rocks that can contain hydrocarbons. Porosity is the measure of a rock’s ability to hold hydrocarbons like oil and gas, water, and condensates. Absolute porosity contains effective (interconnected) and ineffective (isolated) porosity. Effective porosity is the volume of connected pores, but isolate is the pore volume which is not connected to the pore network. Isolated porosity can be significant in volcanic rocks and some carbonates.
Porosity Measurement of a Rock
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- 1. 1 2 Across 1 The process where sediments are forced together by pressure. (10) 3 6 Sedimentary rock composed of small grains of sand (quartz and feldspar). (9) 4 5 7 Very hard sedimentary rock that often forms inside limestone. (5) 6 9 Sedimentary rock composed of the mineral calcite, which comes from 7 8 evaporated seabed and animal shells. (9) 11 The process where sediments are glued together by minerals. (11) 9 10 12 Stratified. (7) 11 12 Down 2 This builds up as layer after layer of sediments pile on top of each other. It is necessary for the process of compaction. (8) 3 Something paleontologists often find in sedimentary rocks. (7) 4 Sedimentary rock made from large sediments like rocks and pebbles. (12) 5 Rocks formed from sediment deposits. (11) 8 The process of breaking apart rocks by wind, rain, and temperature. (7) 10 Sedimentary rock composed of compacted clay. (5) 11 A fossil fuel created from plant deposits millions of years ago. (4)