Sequence architecture, depositional systems, and controls on development of lacustrine basin fills in part of the Erlian basin, northeast China

Citation
Cs. Lin et al., Sequence architecture, depositional systems, and controls on development of lacustrine basin fills in part of the Erlian basin, northeast China, AAPG BULL, 85(11), 2001, pp. 2017-2043
Citations number
69
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
AAPG BULLETIN
ISSN journal
0149-1423 → ACNP
Volume
85
Issue
11
Year of publication
2001
Pages
2017 - 2043
Database
ISI
SICI code
0149-1423(200111)85:11<2017:SADSAC>2.0.ZU;2-D
Abstract
Sequence architecture and depositional systems of a Jurassic-Cretaceous lac ustrine rift succession in the Wuliyashitai subbasin, and Erlian basin in n ortheastern China were investigated using seismic profiles, complemented by well logs and cores. Five second-order or composite sequences are identifi ed on the basis of basin-scale unconformities. Constituent third-order sequ ences are defined by unconformities along the basin margins and correlative conformities within the central basin. Lowstand-transgressive and highstan d systems tracts are separated by major lake flooding surfaces. Depositiona l systems identified in the basin include alluvial fan, incise valley, fan delta, braid delta, and sublacustrine fan. Three types of lacustrine sequen ces, consisting of distinctive depositional systems, formed during differen t tectonic stages: (1) alluvial-shallow-lacustrine sequences (type A) devel oped during the initial rifting stage; (2) shallow-lacustrine to deep-lacus trine sequences (type B) formed during the early and late periods of riftin g; and (3) deep-lacustrine sequences (type C) developed in response to rapi d tectonic subsidence during the middle, maximum-rifting stage. Uplift following each rifting episode related to changes in the paleostress field appears to have been the major control on the formation of high-orde r sequence boundaries (second-order and some third-order sequences). Block rotation, coupled with lake level fluctuations, controlled the formation of most third-order sequence boundaries. Forward simulation modeling suggests that development of different lacustrine sequence types can be related to a balance between tectonic subsidence and sediment input. Deltaic sandstone bodies and incised valley fills along the hinged margins within the shallow-lacustrine and deep-lacustrine sequences and sublacustri ne-fan sandstones in the central basin are the economically most important reservoir sandstones in the basin. Fan-delta deposits along the escarpment margin constitute another potential reservoir type.