研究珠江口盆地HZ26-6构造“双古”领域油气成藏期次和油气成藏条件,探讨油气成藏特点与富集规律。在借鉴前人研究成果的基础上,通过铸体薄片鉴定、包裹体均一温度测定等手段,厘清了HZ26-6构造“双古”领域三大油气主力成藏期及对应的...研究珠江口盆地HZ26-6构造“双古”领域油气成藏期次和油气成藏条件,探讨油气成藏特点与富集规律。在借鉴前人研究成果的基础上,通过铸体薄片鉴定、包裹体均一温度测定等手段,厘清了HZ26-6构造“双古”领域三大油气主力成藏期及对应的流体充注类型,即13.8~10 Ma B.P.的低熟原油充注期,10~5.3 Ma B.P.的成熟原油充注期,5.3 Ma B.P.以来的天然气充注期;依据实际的地质、钻井、测井、地震等资料梳理了HZ26-6构造“双古”领域三大油气成藏关键条件,即以“早期低熟缓慢生油,晚期高熟快速生气”为特点的烃源条件,以“裂缝带风化叠加改造成储,转换带砂砾岩体规模成储”为特征的储层条件,以“通源断裂多期跨层输导,深缝浅砂侧向差异运移”为特征的输导条件。HZ26-6构造“双古”领域具有“早油晚气,宽窗强供;扇加潜山,规模储集;断缝断砂,高效输导;递进充注,整装成藏”的油气成藏特点,以及“油型盆地早油晚气条件下,宽窗强势供烃、‘双古’整装成藏”的油气富集规律。展开更多
The sequence of the densification and hydrocarbon charging of the Xu2 reservoir in the Anyue–Hechuan area of Central Sichuan Basin is discussed.The diagenetic sequence is considered a time line to determine the histo...The sequence of the densification and hydrocarbon charging of the Xu2 reservoir in the Anyue–Hechuan area of Central Sichuan Basin is discussed.The diagenetic sequence is considered a time line to determine the historical relationship between the densification process and the hydrocarbon charging of the Xu2 reservoir in the study area:Early diagenetic stage B(the first stage of hydrocarbon charging,which was about 200–160 Ma ago,with a porosity of about 20%,consolidated and not tight)→middle diagenetic stage A(the second stage of hydrocarbon charging,which was about 140–120 Ma ago,with a porosity of 10%–20%and relatively tight)→middle diagenetic stage B(the third stage of hydrocarbon charging,which was about 20–5 Ma ago,with a porosity of 6%–10%and tight;However,fractures have developed).The study results prove that large-scale hydrocarbon charging and accumulation completed before the densification of the Xu2 reservoir,showing that the Upper Triassic Xujiahe Fm unconventional tight reservoir in the Sichuan Basin is prospective for exploration.展开更多
文摘研究珠江口盆地HZ26-6构造“双古”领域油气成藏期次和油气成藏条件,探讨油气成藏特点与富集规律。在借鉴前人研究成果的基础上,通过铸体薄片鉴定、包裹体均一温度测定等手段,厘清了HZ26-6构造“双古”领域三大油气主力成藏期及对应的流体充注类型,即13.8~10 Ma B.P.的低熟原油充注期,10~5.3 Ma B.P.的成熟原油充注期,5.3 Ma B.P.以来的天然气充注期;依据实际的地质、钻井、测井、地震等资料梳理了HZ26-6构造“双古”领域三大油气成藏关键条件,即以“早期低熟缓慢生油,晚期高熟快速生气”为特点的烃源条件,以“裂缝带风化叠加改造成储,转换带砂砾岩体规模成储”为特征的储层条件,以“通源断裂多期跨层输导,深缝浅砂侧向差异运移”为特征的输导条件。HZ26-6构造“双古”领域具有“早油晚气,宽窗强供;扇加潜山,规模储集;断缝断砂,高效输导;递进充注,整装成藏”的油气成藏特点,以及“油型盆地早油晚气条件下,宽窗强势供烃、‘双古’整装成藏”的油气富集规律。
基金Project(41372141) supported by the National Natural Science Foundation of ChinaProject(2008ZX05001–05–01) supported by Special and Significant Project of National Science and Technology,China
文摘The sequence of the densification and hydrocarbon charging of the Xu2 reservoir in the Anyue–Hechuan area of Central Sichuan Basin is discussed.The diagenetic sequence is considered a time line to determine the historical relationship between the densification process and the hydrocarbon charging of the Xu2 reservoir in the study area:Early diagenetic stage B(the first stage of hydrocarbon charging,which was about 200–160 Ma ago,with a porosity of about 20%,consolidated and not tight)→middle diagenetic stage A(the second stage of hydrocarbon charging,which was about 140–120 Ma ago,with a porosity of 10%–20%and relatively tight)→middle diagenetic stage B(the third stage of hydrocarbon charging,which was about 20–5 Ma ago,with a porosity of 6%–10%and tight;However,fractures have developed).The study results prove that large-scale hydrocarbon charging and accumulation completed before the densification of the Xu2 reservoir,showing that the Upper Triassic Xujiahe Fm unconventional tight reservoir in the Sichuan Basin is prospective for exploration.
