Pressure Characteristics and Its Influence on Hydrocarbon Accumulation of Lower Cretaceous Formation in Longfengshan Area, Changling Faulted Depression

doi:10.3969/j.issn.1006-6535.2022.02.006

Abstract

Abstract: Longfengshan Area in Changling Faulted Depression is abundant in Lower Cretaceous hydrocarbon resources, and the hydrocarbon distribution is obviously controlled by abnormal pressure, so it is important to study the characteristics of formation pressure and its influence on hydrocarbon. The measured formation pressure and logging data were used to analyze the pressure characteristics of Lower Cretaceous Formation in Longfengshan Area and explore the causes of the overpressure in Shahezi Formation. The evolution of formation paleopressure was restored by the inclusion homogenization temperature-salinity method in combination with the basin modeling technology to determine the influence of formation pressure evolution on hydrocarbon accumulation. The results showed that the bottom-up pressure of Lower Cretaceous Formation in the study area was normal pressure, overpressure and normal pressure, and Shahezi Formation was under overpressure due to pressurization during hydrocarbon generation; the northern subsag belt was at the center of overpressure in the study area, and the formation pressure transited to normal pressure in all directions; the evolution of formation pressure experienced five stages: pressurization during early hydrocarbon generation, initial pressure release, pressurization during late hydrocarbon generation, secondary pressure release, and slow pressure accumulation; the overpressure generated in hydrocarbon generation of source rocks of Shahezi Formation was the main driving force of hydrocarbon migration, and the hydrocarbon migrated along the direction of the remaining formation pressure drop and mainly accumulated in the southeast gentle slope belt. The study results have a certain guiding significance for the in-depth exploration and development of Longfengshan area, Changling Faulted Depression.

Key words: abnormally high pressure, pressurization during hydrocarbon generation, paleopressure evolution, hydrocarbon accumulation, inclusion, Changling Faulted Depression.

CLC Number:

TE122

Song Hao, Jiang Youlu, Hou Shuai, Chen Xingxia. Pressure Characteristics and Its Influence on Hydrocarbon Accumulation of Lower Cretaceous Formation in Longfengshan Area, Changling Faulted Depression[J]. Special Oil & Gas Reservoirs, 2022, 29(2): 42-50.

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