大庆油田成藏过程定量研究

QUANTITATIVE STUDY ON OIL POOL FORMING PROCESS OF DAQING OIL FIELD

油气成藏过程涉及油气生成，运移，聚集全过程，在确定油气成藏过程研究单元时，必须包含可能供给油气藏的所有油气，依据油气势能理论，提出以流体势能的高值面为边界的聚油系统为成藏过程研究单元，综合应用计算机模拟技术和油层自生伊利石K－Ar同位素定年技术，结合成藏年代学研究的传统方法，阐明了大庆油田油藏的成藏过程，大庆油田成藏动力学系统内主要烃源岩在77．4Ma进入生油门限，73－65Ma为生油高峰期，大庆油田北部的背斜构造油藏成藏年代在65－40Ma，南部岩性与构造联合控制的油藏成藏年代为77．4－73Ma。

Oil and gas pool forming process involved all of the process of hydrocarbon generation,migration and accumulation,so that the determination of the its study unit must contain all of oil and gas which probably related ot the oil and gas pool forming process.Based on hydrocarbon potential energy theory, the hydrocarbon accumulatin system, which take the highest potential energy interfaces as boundary,is considered as the unit for hydrocarbon pool forming process study. On comprehensive application of computer modeling and K-Ar isotopic timing technique,combined with traditional methods of hydrocarbon pool forming chronology,the forming process of Daqing oil field is clarified.The main source rock of Daqing oil field hydrocarbon accumulation system got into oil window at 77. 4 Ma, the generation peak period was between 73Ma to 65Ma. The anticlinal structure oil accumulations which located in north part of Daqing oil field formed during 65Ma to 40Ma,and the oil accumulations con-troled by both structure and lithology located in south part of Daqing oil field formed between 77. 4Ma to 65Ma.