scholarly journals Clay mineral content of continental shelf and river sediments, southern California

2001 ◽  
Author(s):  
James R. Hein ◽  
Jennifer S. Dowling
Keyword(s):  
Continental Shelf ◽  
Clay Mineral ◽  
Southern California ◽  
Mineral Content ◽  
River Sediments

Clay-mineral suites, sources, and inferred dispersal routes: Southern California continental shelf

2003 ◽  
Vol 56 (1-2) ◽  
pp. 79-102 ◽  
Author(s):  
James R. Hein ◽  
Jennifer S. Dowling ◽  
Anthony Schuetze ◽  
Homa J. Lee
Keyword(s):  
Continental Shelf ◽  
Clay Mineral ◽  
Southern California ◽  
Dispersal Routes

Depositional Environment Drive as Overpressure Generation: Study Case in “Gap” Field, North West Java Basin

2020 ◽  
Author(s):  
A., C. Prasetyo
Keyword(s):  
Clay Mineral ◽  
Depositional Environment ◽  
Mineral Content ◽  
Hydrocarbon Generation ◽  
Well Test ◽  
Burial History ◽  
The South ◽  
North West ◽  
The North ◽  
Geological Processes

Overpressure existence represents a geological hazard; therefore, an accurate pore pressure prediction is critical for well planning and drilling procedures, etc. Overpressure is a geological phenomenon usually generated by two mechanisms, loading (disequilibrium compaction) and unloading mechanisms (diagenesis and hydrocarbon generation) and they are all geological processes. This research was conducted based on analytical and descriptive methods integrated with well data including wireline log, laboratory test and well test data. This research was conducted based on quantitative estimate of pore pressures using the Eaton Method. The stages are determining shale intervals with GR logs, calculating vertical stress/overburden stress values, determining normal compaction trends, making cross plots of sonic logs against density logs, calculating geothermal gradients, analyzing hydrocarbon maturity, and calculating sedimentation rates with burial history. The research conducted an analysis method on the distribution of clay mineral composition to determine depositional environment and its relationship to overpressure. The wells include GAP-01, GAP-02, GAP-03, and GAP-04 which has an overpressure zone range at depth 8501-10988 ft. The pressure value within the 4 wells has a range between 4358-7451 Psi. Overpressure mechanism in the GAP field is caused by non-loading mechanism (clay mineral diagenesis and hydrocarbon maturation). Overpressure distribution is controlled by its stratigraphy. Therefore, it is possible overpressure is spread quite broadly, especially in the low morphology of the “GAP” Field. This relates to the delta depositional environment with thick shale. Based on clay minerals distribution, the northern part (GAP 02 & 03) has more clay mineral content compared to the south and this can be interpreted increasingly towards sea (low energy regime) and facies turned into pro-delta. Overpressure might be found shallower in the north than the south due to higher clay mineral content present to the north.

Identification of Yangtze River and Yellow River Paleochannels in South Yellow Sea Shelf

2013 ◽  
Vol 664 ◽  
pp. 27-31
Author(s):  
Zhao Jun Song ◽  
Jin Zhou ◽  
Qiao Chen ◽  
Zhen Kui Gu
Keyword(s):  
Continental Shelf ◽  
Yellow Sea ◽  
Yangtze River ◽  
Yellow River ◽  
River Sediments ◽  
The Yangtze River ◽  
South Yellow Sea ◽  
The South ◽  
Research Results ◽  
The South Yellow Sea

research of submarine paleochannels has not only a great significance in exploring the evolution of palaeoenvironment of continental shelf but also a practical application value in solving problems on disaster geology and environmental geology in the continental shelf development. Yellow River and Yangtze River both were concentrated in the northern Jiangsu to enter the South Yellow Sea Basin in the Last Glacial, playing an important role in the palaeoenvironment evolution of the South Yellow Sea. On the basis of integrating previous research results and researching a large number of shallow stratigraphic sections of paleochannels in the South Yellow Sea Shelf in detail, identification and research of Yangtze River and Yellow River paleochannels in the South Yellow Sea Shelf are carried out in this paper. Research results show that: the Yangtze River and Yellow River paleochannels in the South Yellow Sea continental shelf are significantly different in the river section, river pattern, major elements, as well as trace elements, clay minerals, carbonate content and heavy mineral assemblages in the river sediments and other aspects. These differences can be used as the evidence for identification of the Yangtze River and Yellow River paleochannels.

Prediction of Element and Clay Mineral Content in Lacustrine Mudstone Using Logging Data: an example from Dongying Depression

2015 ◽  
Vol 89 (s1) ◽  
pp. 378-382 ◽  
Author(s):  
Zhonghong CHEN ◽  
Wei HUANG ◽  
Tengkui SUN ◽  
Xiaoyang WANG ◽  
Zhiqiang CHEN
Keyword(s):  
Clay Mineral ◽  
Mineral Content ◽  
Dongying Depression

Clay Mineral Content of Two Domestic Kaolins

1960 ◽  
Vol 43 (6) ◽  
pp. 335-335 ◽  
Author(s):  
W. C. ORMSBY ◽  
J. M. SHARTSIS
Keyword(s):  
Clay Mineral ◽  
Mineral Content

Pore types, pore-network analysis, and pore quantification of the lacustrine shale-hydrocarbon system in the Late Triassic Yanchang Formation in the southeastern Ordos Basin, China

2017 ◽  
Vol 5 (2) ◽  
pp. SF63-SF79 ◽  
Author(s):  
Robert G. Loucks ◽  
Stephen C. Ruppel ◽  
Xiangzeng Wang ◽  
Lucy Ko ◽  
Sheng Peng ◽  
...  
Keyword(s):  
Organic Matter ◽  
Clay Mineral ◽  
Mineral Content ◽  
Ordos Basin ◽  
Pore Network ◽  
Black Shales ◽  
Late Triassic ◽  
Ductile Material ◽  
Crushed Rock ◽  
Porosity And Permeability

Continental Upper Triassic Yanchang “black shales” in the southeastern Ordos Basin have been proven to be unconventional gas reservoirs. Organic-matter-lean and organic-matter-rich argillaceous mudstones form reservoirs that were deposited in a deeper water lacustrine setting during lake highstands. In the stratified lake, the bottom waters were dysaerobic to anoxic. This low-energy and low-oxygen lake-bottom setting allowed types II and III organic matter to accumulate. Interbedded with the argillaceous mudstones are argillaceous arkosic siltstones deposited by gravity-flow processes. Rock samples from the Yanchang Chang 7–9 members are very immature mineralogically. Mineral grains are predominantly composed of relatively equal portions of quartz and feldspar. The high clay-mineral content, generally greater than 40%, has promoted extensive compaction of the sediments, permitting the ductile material to deform and occlude interparticle pores. Furthermore, this high clay-mineral content does not favor hydraulic fracturing of the mudstone reservoir. The pore network within the mudstones is dominated by intraparticle pores and a lesser abundance of organic-matter pores. Interparticle pores are rare. The mean Gas Research Institute (GRI) crushed-rock porosity is 4.2%. Because the pore network is dominated by poorly connected intraparticle pores, permeability is very low (the GRI-calculated geometric mean permeability = 9.9 nd). The dominance of intraparticle pores creates a very poor correlation between GRI porosity and GRI permeability. Several methods of porosity analysis (GRI crushed rock, nitrogen adsorption, and point count) were conducted on each samples, and the results were compared. There is no significant correlation between the three methods, implying that each method measures different pore sizes or types. There is also no relationship between the porosity and permeability and total organic carbon. Much of the mature (peak oil window) organic matter is nonporous, suggesting that it is of type III. Most of the organic-matter pores are in migrated solid bitumen. Overall, the samples analyzed have low porosity and permeability for mudrocks.

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