Modelling of hydrocarbon generation in the Cenozoic Song Hong Basin, Vietnam: a highly prospective basin

Source Rock Properties of Lacustrine Mudstones and Coals (Oligocene Dong Ho Formation), Onshore Song Hong Basin, Northern Vietnam

“…During the Late Oligocene to Early Miocene post-rift phase, deltaic and paralic coal-bearing strata were deposited in the Hanoi Trough and in the northern part of the Song Hong Basin. In general, the syn-rift sediments are separated from the post-rift deposits by an unconformity, dated at 30 Ma, which is probably related to the onset of sea-floor spreading in the East Vietnam Sea and the formation of oceanic crust (Rangin et al, 1995;Nielsen et al, 1999). Palaeogene extension led to the general NW-SE orientation of grabens and half-grabens in the northern Song Hong Basin (Fig.…”

World‐class Paleogene Oil‐prone Source Rocks From a Cored Lacustrine Syn‐rift Succession, Bach Long Vi Island, Song Hong Basin, Offshore Northern Vietnam

“…The basin is generally considered to be South China Sea VI01_02_056_01_MBWF_BLV_SR gas-prone because of the deep burial of the syn-rift succession and the dominance of coaly organic matter in the post-rift succession, and gas is produced from Chinese acreage (e.g. Hao Fang et al, 1995;Chen Honghan et al, 1998;Nielsen et al, 1999). Coaly source rocks are indicated by the fact that several offshore petroleum shows have a characteristic terrigenous organic geochemical signature; thus at the 102-CQ-1x well, waxy oil has been correlated to Lower Miocene coals recorded in the nearby 102-HD1x well (Andersen et al, 2005) (well locations in Fig.…”

Discovery of native aluminum and its possible origin from prospective gas hydrate areas in the South China Sea

“…Sur- [28,30], seep community [31] and carbonate precipitation [26,29,32], high level of CH4 and H2S in sediments [31], mud diapir structures [33], seep carbonate precipitations and musselshell in site ROV-G Carbonate precipitations in core of ODP184-1146 [34], BSR in core's adjacent area [28], nature gas hydrate [35] and seep precipitations [27], high level of CH 4 in water column [36] Strike-slip faults, exploited oil/gas fields and cold seeps [37,38], oil/gas seeps [39], hydrocarbon anomaly [39,40], pyrite in sediments [41] Fold-thrust structures, BSR [42], pyrite and gypsum [41,43], methane-concentration enhancement beneath the seafloor [44], hydrocarbon anomaly [39,44] ; 8. Other prospective area in the SCS [39,40] face sediment samples were hermetically sealed in polythene bags after separation on board of the ship, and core sediment samples were preserved under room temperature.…”

“…As is the case in the Nansha Trough where surface sediments contain gypsum and pyrite assemblages in association with cold seeps [41,43], typical H 2 S was smelled when the sediments were separated on the shipboard. At the Zhongjiannan Basin and Wan'an Basin, fewer investigations of gas hydrate or cold seep have been carried out and seep precipitations have not been reported, but limited evidence still suggests that these regions are favorable for gas hydrate accumulations [37][38][39][40][41]. Thus it can be concluded that the conditions were reducing where Al° particles occurred in the SCS, implying the Al° formation was associated with the cold seep environments.…”

“…Under these temperature-pressure conditions, the SCS geological settings are in favor of gas hydrate formation and conservation [28][29][30]. Recently, a great deal of work about gas hydrate reservoirs has been done in the northern continental slope of SCS, and subsequently multiple lines of evidence related to gas hydrate were identified [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] (Table 1) and several prospective areas for gas hydrate occurrence were discovered and outlined (Figure 1). Notably, natural gas hydrate was detected near 200 m below seafloor in the Shenhu area of the northern SCS in 2007 [35].…”