Geologic and structural characters of Liaohe fault depression--Rich in oil and gas rift valley in northeastern China

Conference · Wed Jan 01 00:00:00 EST 1992 · Geological Society of America, Abstracts with Programs; (United States)

OSTI ID:6106874

Chen, Quanmao ^[1]

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1. China Univ. of Geosciences, Wuhan (China)

Liaohe fault depression is famous for its first class in per square kilometer oil reserves and yield, and the third level in output in China. It lies in the north part of Bo Sea and Liaoning province with about 12,400 km[sup 2] in onshore area. The basement consisted of metamorphic rocks, covered by upper Jurassic-lower Cretaceous red clastic formation intercalated by a coal system stratum (1,600 m), Eogene dark mudstone and sand-conglomeratic rock formation with 1,200m source bed (about 7,000m), and Neogene-Quaternary motley sand-mudstone formation (more than 1,000m). Fourteen sets of oil-bearing strata exist in the basement and overburdens. Liaohe depression is characterized by a horst and graben system. The features are as follows: (1) bulge and sag alternate within depression; (2) the shape of depression and the undulation of basement are the mirror image of Moho; (3) the magnificent Tanlu strike-slip fault system runs through the middle Liaohe area, the faults are almost normal faults with some strike-slip natures; (4) alkaline volcanics erupted many times from later Mesozoic to Cenozoic; (5) high heat flux, the average value is 2.24 HFU, the geothermal gradient is 4 C/100m in Eogene; (6) seismic activity was frequent, according to statistics, before the Haicheng earthquake which was of 7.3 magnitude in 1975, there were 257 shocks lower than 4.7 magnitude; (7) the extensional rate of rift valley is about 20%; (8) trap is related to compacting anticline, rollover anticline, pinching sandstone, onlap strata, confined fault block, stratigraphic unconformity, diapiric mudstone dome and buried hills.

• OSTI ID: 6106874
• Report Number(s): CONF-921058-; CODEN: GAAPBC
• Journal Information: Geological Society of America, Abstracts with Programs; (United States), Vol. 24:7; Conference: 1992 annual meeting of the Geological Society of America (GSA), Cincinnati, OH (United States), 26-29 Oct 1992; ISSN 0016-7592
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
58 GEOSCIENCES
CHINA
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
GEOLOGIC STRUCTURES
COAL SEAMS
EARTHQUAKES
GEOLOGIC FAULTS
LITHOLOGY
PETROLEUM
RESERVES
RIFT ZONES
STRATIGRAPHY
VOLCANISM
ASIA
COAL DEPOSITS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
GEOLOGIC FRACTURES
GEOLOGY
MINERAL RESOURCES
PETROLOGY
RESOURCES
SEISMIC EVENTS
020200* - Petroleum- Reserves
Geology
& Exploration
030200 - Natural Gas- Reserves
Geology
& Exploration
580000 - Geosciences