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Meeting Location: 
Churrascos - River Oaks
2055 Westheimer Road
Houston, TX 77098

5:30 to 6:00 PM Happy Hour
6:00 to 7:00 PM Dinner
7:00 to 8:00 PM Presentation
8:00 until ...  Networking

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Speakers: William Dickson, Founder of DIGS (Dickson International Geosciences)

Co-Authors: Mark Odegard, GrizGeo, Jim Granath, Granath Assoc. and Janice Stringer, formerly Christ

This talk pulls from an article series in SEAPEX Press that began with Old One Hundred, the last physical issue, in mid-2020; and a talk from the 2022 AsiaPac conference in London. Our work updates a non-exclusive regional evaluation by Janice (Jan) Christ* and James W (Jim) Granath that was completed in 2006. New and expanded framework data (DEM-G-M and derived products) by Mark Odegard plus global geoscience progress prompted revisions that yielded our articles.
The key understanding in the evolution of the offshore basins of the northwestern South China Sea hinges (literally) on the Song Hong/Yinggehai (SHY) Basin which we visualize with gravity and magnetics imagery. Its eastern margin is the segmented trace of the combined Red River - Number 1 - East Vietnam Fault (RRN1EVF) as discussed in SEAPEX Press n106. The SHY basin formed as a crustal detachment slid from the south and west into the volume formed by the complex movements of this eastern boundary fault. Secondary structural features formed in response to these movements including a subtle roughly west-east trend within SHY that seems to control the distribution of Miocene fans within the basin.
Farther south in the Phu Khanh Basin (PK), Late Miocene basin-floor fan systems are interpreted in sags that formed in response to basin cooling after the 10 Ma Mid-Miocene Unconformity. The outboard limit of this system has been/is being uplifted and eroded along the boundary with South China Sea oceanic crust (SCS-OC). This provides access for seafloor sampling of migrating hydrocarbons and their host rocks.
Factors we reference in our talk as a spur to conversation include

• drone-based surveys of Bach Long Vi Island, western Beibuwan basin, and mapped outcrops of Oligocene sand injectites
• documentation of a lacustrine/intermontane GDE at Bach Long Vi Island and in nearby wells
• re-evaluation of "shale diapir" concept that dominates SHY development to date
• controls on Tertiary fan plays including location, paleo-water depths and sediment provenances
• association of known sand injectite plays with rapid burial and related overpressure environments
• thoughts on hydrocarbon maturation & migration models with an example correlation of an interpreted source kitchen in PK with our gravity imagery

Speaker Biography:  William Dickson, DIGs (Dickson International Geosciences)
William Dickson is the founder and VP-Technology for DIGs (Dickson International Geosciences) in Houston. He works principally in multi-disciplinary mode, building super-regional basin studies with a range of subject matter experts. His primary geographic focus on South Atlantic margin basins and a secondary focus on Southeast Asia build on decades of international and frontier exploration projects, with majors, IOCs and his consultancy. Since his first interpretations, he has involved gravity and magnetics data, despite a limited understanding of the methods. Bill is a member of AAPG, EAGE, GESGB (fka PESGB), SEAPEX, SEG, SPE and local societies in Houston. He has authored and contributed to papers on aspects of South Atlantic and SE Asian geology. He is a co-organizer of recent HGS-PESGB Africa conferences and serves on the board of AAPG's Datapages subsidiary.

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