Geological-Geophysical “Gradual Prediction” Method for Up-dip Pinch-out Sandstone of Zhujiang Formation, Huizhou Area, Pearl River Estuary Basin

doi:10.19657/j.geoscience.1000-8527.2019.06.09

Abstract

Abstract:

Up-dip pinch-out sandstone reservoir is an important rock reservoir type, and its characterization and description is a key to evaluate up-dip pinch-out traps. Within the third-order sequence, which is mainly composed of deltaic front deposition, the geological-geophysical “gradual prediction” method (to describe the up-dip pinch-out deltaic sand-bodies) has great significance to delineate and explore up-dip pinch-out sandstone reservoirs. This method consists of five parts: (1) Based on third-level sequence identification, high resolution sequence stratigraphic division technology is used to establish the high-resolution (fourth-order) sequence stratigraphic framework; (2) Use seismic sedimentologic technology to describe the planar sedimentary facies distributions under high-frequency sequences; (3) Based on geological models, spectral imaging technique is used to delineate the distributions of the pinch-out zone; (4) Facies-controlled reservoir inversion is conducted to (semi)-quantitatively delineate the sand-body pinch-out line; (5) According to different sedimentary characteristics of sand-bodies, a forward modelling is performed to extrapolate the pinch-out lines.

Key words: up-dip pinch-out sandstone, high resolution sequence stratigraphy, seismic sedimentology, spectral imaging, facies-controlled reservoir inversion, forward modelling

CLC Number:

TE122.2

RUI Zhifeng, LIN Changsong, GUO Jia, DU Jiayuan, DING Lin, LI Xiao. Geological-Geophysical “Gradual Prediction” Method for Up-dip Pinch-out Sandstone of Zhujiang Formation, Huizhou Area, Pearl River Estuary Basin[J]. Geoscience, 2019, 33(06): 1229-1240.

Figures/Tables 12

Fig.1 Sedimentary and litho-stratigraphic trap formation background of the target sequences

Fig.2 Geological-geophysical “gradual prediction” of the pinch-out line

Fig.3 High resolution sequence division model and schematic diagram of the internal structural characteristics within fourth-order sequence of the delta system

Fig.4 High-resolution stratigraphic division in the study area using well and seismic data

Fig.5 Attribute optimization process

Fig.5 Interpretation of depositional architecture using well data and seismic data

Fig.7 Comprehensive interpretation of seismic sedimentology of fourth-order SQ2-II sequence

Fig.8 Response characteristics of the pinch-out point in the original seismic profile, 30 Hz and 90 Hz spectral imaging profiles(profile location shown in Fig.1)

Fig.9 Identification of the pinch-out line distribution using spectral imaging in different sequences

Fig.10 Sand-body tip line response characteristics on the reservoir inversion profile under the constraints of facies

Fig.11 Pinch-out error simulation of forward extrapolation of different hydrodynamic sand-bodies

Fig.12 Planar distribution of the pinch-out line predicted by reservoir inversion (black) and forward extrapolation (blue)

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