Formation mechanism and characteristics of sandy conglomerate diagenetic trap: a case study of the Triassic Baikouquan Formation in the Mahu Sag, Junggar Basin

被引：0

作者：

Research Institute of Petroleum Exploration & Development-Northwest, PetroChina, PetroChina, Lanzhou, China ^{[1
]}

不详 ^{[2
]}

机构：

[1] Research Institute of Petroleum Exploration & Development-Northwest, PetroChina, PetroChina, Lanzhou

[2] Research Institute of Exploration and Development, Xinjiang Oilfield Company, Karamay

来源：

Nat. Gas Geosci. | / 41-49期

关键词：

Baikouquan Formation; Diagenetic trap; Junggar Basin; Sandy conglomerate; Secondary pore;

D O I：

10.11764/j.issn.1672-1926.2015.S1.0041

中图分类号：

学科分类号：

摘要：

The diagenetic trap with many genetic types is one of the most important types of hydrocarbon traps. Sandy conglomerate diagenetic trap of the Triassic Baikouquan Formation in the Mahu Sag, Junggar Basin is an important genetic type, which is genetically controlled by sedimentary facies and diagenetic phases. The Baikouquan Formation is dominated by fan-delta deposition. In direction of provenance, secondary pore reservoirs of diagenetic trap consist of fan-delta front sandy conglomerate, of which the feldspars are dissolved by organic acid, and the fan delta plain tight conglomerate seals of diagenetic trap are formed by strong compaction and cementation in the upper direction. In perpendicular direction of provenance, secondary pore reservoirs of diagenetic trap distribute in the dominant migration pathway of the organic acid, which is comprised of source-faults and ancient nose structures. The lateral seals of diagenetic trap consist of interdistributary mudstone, fan delta plain tight sandy conglomerate of other provenances, and fan delta front tight sandy conglomerate distributing on sides of the pathways. The base seals consist of weathered clay layer, fan delta plain tight sandy conglomerate, and transgressive shallow lake mudstone, and the top seals consist of transgressive shallow lake mudstone. Distributing in the dominant migration pathway of the organic acid, stacking and clustering laterally, the Baikouquan sandy conglomerate diagenetic traps have the advantages of forming large-scale hydrocarbon accumulation, becoming the most important exploration target in the Mahu Sag. The finding of Baikouquan sandy conglomerate diagenetic traps could provide a model for trap exploration of the steep alluvial fan and fan delta in the eastern rift basins and foreland basins in the central and western China. © 2015, Science Press. All right reserved.

引用

页码：41 / 49

页数：8

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