摘要
歧深1井是一口位于渤海湾盆地黄骅坳陷歧口凹陷滨海断鼻的深层探井,在4823.0～5088m沙三段地层用10.32mm油嘴日产气54611m3。天然气甲烷、乙烷碳同位素异常重,δ13C1值在-35.7‰～-32.7‰之间,δ13C2值在-19.1‰～-15.2‰之间。通过对该井沙三段烃源岩热解气碳同位素和轻烃的研究,并结合天然气组分、碳同位素和轻烃以及储层包裹体的特征,认为该天然气属于高成熟天然气,主要来自研究区埋深更大的沙三段烃源岩,具有多期充注的特征。证实歧口凹陷存在高成熟,甚至过成熟天然气,进一步明确歧口凹陷深层天然气勘探要以沙二段、沙三段为主要目的层。
Qishen 1 well is a deep exploratory well that is located in the Binhai fault nose of the Qikou sag in the Huanghua depression, Bohai Bay Basin. The well section in depth of 4 823.0-5 088 m was tested and produced 54 611 m^3/d gas by a 10.32 mm nozzle tip. Carbon isotope values of the natural gas are abnormally heavy： δ^13C1 is between -35.7‰--32.7 ‰, δ^13C1 is between -19.1‰--15.2 ‰. Based on the integrated study of the carbon isotope value and light hydrocarbon composition of pyrolysis gas from the Es3 source rock, the gas composition, light hydrocarbon composition and carbon isotope value of natural gas and the characteristics of reservoir inclusions, it is considered that the natural gas of Qishenl is a high maturity gas, mainly from the deeper Es3 source rock with several injection periods. This understanding proves the existence of high-over mature natural gas in the Qikou sag and identifies Es2 and Es3 as the deep gas exploration prospects.
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2009年第3期392-399,共8页
Natural Gas Geoscience
基金
中国石油股份公司重大专项"歧口富油凹陷大油气田勘探及综合配套技术研究"(编号:2008E-030603)资助
关键词
碳同位素
轻烃
天然气
成因分析
歧深1井
歧口凹陷
黄骅坳陷
Carbon isotope
Light hydrocarbon
Natural gas
Genetic analysis
Qishen 1 well
Qikou sag
Huanghua depression.
