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Medientyp:
E-Book
Titel:
Tight Oil Accumulation Dynamics of Source-Reservoir Integration in a Slope Belt in a Lacustrine Basin
:
A Case Study of the Third Member of the Palaeogene Shahejie Formation, Qibei Slope, Qikou Sag
Beschreibung:
AbstractIn contrast to that in North America, the tight oil in China is mainly distributed in the centres and wide slopes of lacustrine basins, but studies of the source-reservoir integration in slope belts are relatively scare. In this study, the third member of the Palaeogene Shahejie Formation (Es 3 ) in the Qibei slope belt in the Qikou sag was taken as an example, the period, power, and resistance of the tight oil accumulation of the source-reservoir integration in the slope belt were investigated using basin modelling, sample testing, logging prediction, and physical experiments and numerical simulations of the crude oil filling, the main factor controlling the tight oil accumulation in the slope belt was determined, and a systematic framework for investigating the tight oil accumulation dynamics of source-reservoir integration was developed. The results of this study indicate that two periods of oil charging occurred during 28–23 Ma and 12 Ma to present in the Qibei slope belt. The main factor controlling the tight oil accumulation of the source-reservoir integration in the slope belt is the net power during the late oil charging period, with average values of 7.3 MPa and 4.9 MPa, in the areas near and far from the Qikou main sag, respectively. The crude oil filling occurred in three stages, i.e., the breakthrough, rapid, and fully saturated stages, with threshold pressures of 5.5 MPa, 19 MPa, and 40 MPa, respectively. The net power during the late oil charging can be used to predict the current reservoir’s oiliness. When the value was <5.5 MPa, dry layers were found; when the value was 5.5–18 MPa, fractured oil layers were found; and when the value was >18 MPa, flowing oil layers could be found. The proposed research framework can be used to study the tight oil accumulation dynamics in areas with similar source-reservoir integration