STM 油藏古构造演化与成藏期探讨(英文)

通过ＳＴＭ 油藏古构造演化分析，得出该油藏形成于晚第三纪末期。依据孔隙进油的温度与时间的关系，提出了一种新的确定油藏形成时间的方法：首先由成岩序列研究得出，孔隙进油发生在方解石胶结物形成之后；然后由方解石中的盐水和烃类包体测温，得出方解石沉淀时的温度；再由地温梯度和埋藏史资料，判断方解石沉淀的时间。由于方解石中也含有烃类包体，油藏形成期就应等于或晚于方解石胶结物的形成期。由此方法判断的ＳＴＭ 油气藏形成期与通过古构造演化分析判断的圈团形成期一致

The study of paleostructural evolution and formation time of STM oil and gas pool

STM pool is infered to have formed at the and of Upper Tertiary based on analysis of its paleostructural evolution.A new approach to determine the time of pool formation is proposed in the light of relationship between time and temperature when oil enters pores: First, the research of diagenetic succession shows that oil entered pores after calcite had precipitated; Then the calcite precipitation temperatures can be determined through measurement of temperature of brine and hydrocarbon inclusion enclaves; The next step is to infer the calcite precipitation time by the geothermal gradient and burial history. As some oil enclaves were enclosed within calcite, the oil pool formation time should be equal to or later than calcite cementation time. From this it is known that STM pool formed also at the end of Upper Tertiary, in accord with that inferred by analysis of paleo structural evolution.