Citation: | LI Kun, ZHANG Pei, ZHANG Ping, LI Qian, WAN Lifen, XI Minhong. Analysis of reservoir-forming conditions and key controlling factors of Huagang Formation in the central anticlinal belt of Xihu Sag of East China Sea—Taking the reservoir H3 for example[J]. Marine Geology & Quaternary Geology, 2020, 40(5): 127-135. doi: 10.16562/j.cnki.0256-1492.2019070408 |
A great breakthrough in oil and gas exploration has been made recently from the Huagang Formation in the central anticline belt of the Xihu Sag. Several medium to large oil and gas fields have been discovered. However, the gas column height and fullness ratio of trap differs from each other which suggests that every reservoir has its own key controlling factors. Based on seismic and drilling data, this paper selects the H3 reservoir as a case to study the accumulation conditions of source rocks, traps and combination of reservoir-cap systems. Also this paper sums up the key controlling factor of each reservoir by dissecting four typical reservoirs. The results show that the oil and gas accumulated in H3 reservoir come from the source rocks in Pinghu Formation; the reservoir and caprocks matched each other excellently, and the key factors to control oil and gas accumulation are the effective migration system and fault sealing, and the reservoir preservation condition has great influence on hydrocarbon accumulation.
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The structural location of central anticlinal belt and the integrated stratigraphic column of Xihu Sag
C5-7 components of natural gas of the central anticlinal belt
The relationship between CH4 and heavy hydrocarbon in natural gas of central anticlinal belt
Profile of reservoir-cap combination in H1-H3 sand groups of central anticlinal belt
Seismic profile through central anticlinal belt from south to north(The line position is shown in Fig 1)
The oil and gas system events of Pinghu Formation of central anticlinal belt
An abridged general view of hydrocarbon accumulation model for four typical cases in central anticlinal belt(The line position is shown in Fig 1)
The SGR diagram of controlling fault in the west of D structure