Structural evolution and hydrocarbon accumulation of Luxi Depression

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:425685

Hongliang, Li; Xiao, Qian Hua; Lei, Angui ^[1]

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1. Liaohe Petroleum Exploration Bureau, Liaoning (China)

Located in the eastern Inner Mongolia Autonomous Region, China, Luxi Depression covers an area of 760 km{sup 2} and is one of the more than 250 small rifts of Northeast Rift System, the basement of which is Hercynian told belt. The Depression has undergone two Late Jurassic events: rifting and depression. The rifting sedimentation (the main period) may be divided into four stages: in the initial tensional faulting stage (Yixian Age) are accumulated a set of mantle-sourced volcanic rocks; in the fast subsiding stage (Jiufotang Age) the sedimentary system is distributed in belts under the control of boundary faults; in the steep area alluvial fans and near-shore sublacustrine fans are developed; in the gentle area braided deltas are developed; in the central deep area dark mudstones and sublacustrine gravity flows are developed. Meanwhile the rollover structures began to form on the down-thrown walls of the faults and the drape structures are formed on the convex side of the volcanic rocks. The stable subsiding stage (Shahai Age) is mainly a shallow-semi-deep lacustrine system; the rollover structures are generally finished (Fuxin Age). Most of the fill of the re-rising shrinking stage are near-shallow-lake and marsh facies sedimentation. There are five kinds of oil reservoirs distributed around the oil-generating depressions: rollover anticline, structure-lithology reservoir, updip pinch out, lenticular sandstone, and impermeable sandstone seals. Such reservoir formation models are relatively representative in rift system and can be a model for oil and gas exploration in similar depressions.

• OSTI ID: 425685
• Report Number(s): CONF-960527--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
03 NATURAL GAS
CHINA
EXPLORATION
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
NATURAL GAS
PETROLEUM
RESERVOIR ROCK
TECTONICS