Controlling Effect of Tectonic Evolution on Deposition and Hydrocarbon#br#
Accumulation in Weibei Sag

doi:10.11885/j.issn.1674-5086.2013.07.02.01

Abstract

Abstract:

The complexity of tectonic evolution in Weibei Sag results in unclear understanding of its deposition and hydrocarbon
accumulation law. Based on comprehensive analysis of well drilling，logging and seismic data，we analyzed the boundary
fracture characteristics and sedimentary evolution in Weibei Sag. Studies show that due to the Tan-Lu fault zone continuing
activities，Weibei Sag experienced four evolutionary stages：Sinistral strike-slip，Sinistral-Dextral conversion，Dextral strikeslip
and regional depression. The sinistral strike-slipping（Ek3）formed igneous basement，established the tectonic pattern of
Weibei Sag by sinking in the north and overlapping in the south. The basin hydrocarbon source rocks and fan-delta came from
E W fan delta in sinistral-dextral conversion period（Ek2）. The main reservoir-cap combination formed in dextral strike-slip
period（Ek1 Ed）. The convex′s ancient landforms characteristic formed from it controlled the hollows filling and the growth
characteristic of fan-bodies；deposition center from bottom to top evidently migrated eastward compared to subsidence center.
The Zaohu broken nose band is the main oil and gas migration and accumulation area. Tectonic uplift movement in Es4 last
stage led to rich oil and gas distributed in east and poor distribution in west. Accumulation mode is different between east and
west. Reservoir model of eastern region is single hydrocarbon accumulation period，bilateral transporting and lateral migration.
Reservoir model of western region is two hydrocarbon accumulation periods and near source gathering.

Key words: sediment filling, tectonic evolution, hydrocarbon accumulation model, sinistral-dextral conversion, Weibei Sag

CLC Number:

TE122.3

SUN Yaoting1，2*, LI Yulan1, XU Haoqing2, GUO Lili2. Controlling Effect of Tectonic Evolution on Deposition and Hydrocarbon#br# Accumulation in Weibei Sag[J]. 西南石油大学学报(自然科学版), 2016, 38(1): 21-29.

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Controlling Effect of Tectonic Evolution on Deposition and Hydrocarbon#br# Accumulation in Weibei Sag

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