Shale adalah clay yang mengalami digenesa lanjut, artinya sudah mengalami tambahan Pressure dan Temperature. Kalau carbonaceous shale vs carbonaceous clay, harusnya sama saja. yaitu clay (shale) yg mengandung carbon material. Shale (clay) normalnya dianggap sebagai seal (sekat/tutup) dari suatu petroleoum system. Tapi belakangan ada juga company yg bisa dapat hydrocarbon dari shale/clay. Selain bertindak sebagai seal, ada juga beberapa shale yg bisa bertindak sebagai batuan induk (source rock).
Tanya â€“ Susilowati
Bapak-Bapak or ibu-ibu yg kebetulan dari disiplin geologi, mohon bantuannya.. saya sedang mencoba untuk menyukai bidang geologi, tapi tampaknya masih kurang referensi.. jadi boleh nanya ya…
1. Apa itu carbonaceous clay dan carbonaceous shale??
2. Apa persamaan dari keduanya??
3. apa pula perbedaanya??
4. trus carbonaceous shale itu dikategorikan sebagai apa sih, shale (tutup) atau resevoir??
Saya berharap bisa mendapat jawaban dari millis ini…
Tanggapan 1 – Nataniel Mangiwa
Shale adalah clay yg mengalami digenesa lanjut. artinya sudah mengalami tambahan Pressure dan Temperature. kalau carbonaceous shale vs carbonaceous clay, ya harusnya sama saja. yaitu clay (shale) yg mengandung carbon material.
Shale (clay) normalnya dianggap sebagai seal (sekat/tutup) dari suatu petroleoum system. tapi belakangan saya dengar2 ada juga company yg bisa dapat hydrocarbon dari shale/clay. selain bertindak sebagai seal, ada juga beberapa shale yg bisa bertindak sebagai batuan induk (source rock).
Tanggapan 2 – rd_gautama
What is Shale?
Shale is a fine-grained sedimentary rock that is formed by the compression of muds. This type of rock is composed primarily of quartz and minerals that are found in clay. Shales can be broken easily into thin, parallel layers. Shale is ground up for use in making bricks and cement.
Sedimentary rock pronounced sehd uh MEHN tuhr ee, is rock formed when mineral matter or remains of plants and animals settle out of water or, less commonly, out of air or ice. Sedimentary rock covers about three-fourths of the earth’s land area and most of the ocean floor. In some places, such as at the mouth of the Mississippi River, sedimentary rocks are more than 40,000 feet (12,000 meters) thick. Geologists estimate that sedimentary rock has been forming for at least 31/2 billion years. Sedimentary rock is one of three major kinds of rock. The others are igneous rock (Granite
There are many types of sedimentary rock and they have a variety of uses. The most common sedimentary rock is shale. It is made of compressed mud–that is, a mixture of clay and silt (fine particles of mineral matter). Shale is used in making bricks. Limestone, another common sedimentary rock, is made chiefly of the mineral calcite. Limestone is used for building, for making chalk, and for various other purposes. Cement is made of limestone with a little shale mixed in. Sandstone, made of sand, and conglomerate, composed of sand or gravel particles, are also commonly used for building. The sand or gravel particles in sandstone and conglomerate are held together by a mineral cement. Coal, which consists entirely of compressed plant remains, is a major source of fuel.
Most sedimentary rock starts forming when grains of clay, silt, or sand settle in river valleys or on the bottoms of lakes and oceans. Year after year, these minerals collect and form broad, flat layers called beds or strata. The layers, which differ from one another in composition or texture, distinguish sedimentary from most igneous and metamorphic rock. After thousands of years, the beds of fine silt and clay are squeezed into compact rock layers by the weight of other layers above them. Water that trickles slowly through layers of coarse sand and gravel, deposits mineral cement around these particles, cementing the layers together to form rock. Where the earth’s crust is deformed or eroded, large areas of buried sedimentary rock may be exposed.
Most fossils are found in sedimentary rock. The fossils formed when sediments covered dead plants and animals. As the sediments changed to rock, either the remains or the outlines of the plants and animals were preserved. Some limestone is made entirely of fossil shells.
Source: World Book Encyclopedia
Contributor: Maria Luisa Crawford, Ph.D., Prof. of Geology, Bryn Mawr College.