| Popis: |
Paleogeomorphic restoration plays an important role in sedimentary basin research which has a great geological significance of establishment the sedimentary system and understanding of hydrocarbon accumulation rules. Based on 3D seismic data, drilling data and core data, this paper quantitatively restored paleogeomorphology of Tongbomiao formation in Tanan depression of Haita basin from two aspects of tectonic recovery and sedimentary recovery, and clarified the paleogeomorpholog controlled sedimentary system and oil and gas distribution. This paper indicates that ① the sedimentary period of the Tongbomiao formation has the characteristics of “extensive troughs and multi-sources sediment”, The source is mainly the fan delta in the direction of NW-SE and WS and the paleo-uplift in the depression; that ② the sedimentary period of the Tongbomiao formation main developing alluvial fan, nearshore underwater fan, fan delta and coastal shallow-lake facies, the formation and distribution of alluvial fan were controlled by the ancient uplift in the depression; and that ③ The source faults and the paleogeomorphology features controlled the regular of oil and gas accumulation, the oil migrated by faults in the direction of NE, and the further migration to the north of Tanan depression is the resulted of paleogeomorphology characteristics which is “lower from north to south, lower from west to east”, and oil accumulated in the midwest of the depression. |
