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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第44卷

期数:

2022年第03期

页码:

374-390

栏目:

沉积地质与油气勘探

出版日期:

2022-05-15

文章信息/Info

Title:

Petroleum Phase States and Accumulation Models of the Deep Shahejie Formation of Paleogene in Dongying Depression, China

文章编号:

1672-6561(2022)03-0374-17

作者:

乔荣臻¹; 陈中红¹; 2*; 李趁义³; 王东晔³; 高 阳³; 刘金友⁴

(1. 中国石油大学(华东)地球科学与技术学院,山东 青岛 266580; 2. 长江大学 资源与环境学院,湖北 武汉 430100; 3. 中国石化胜利油田分公司勘探开发研究院,山东 东营 257015; 4. 中国石化胜利油田分公司现河采油厂,山东 东营 257000)

Author(s):

QIAO Rong-zhen¹;  CHEN Zhong-hong¹; 2*;  LI Chen-yi³;  WANG Dong-ye³;  GAO Yang³;  LIU Jin-you⁴

(1. School of Geosciences, China University of Petroleum, Qingdao 266580, Shandong, China; 2. College of Resources and Environment, Yangtze University, Wuhan 430100, Hubei, China; 3. Exploration and Development Research Institute, Shengli Oilfield Branch Company, SINOPEC, Dongying 257015, Shandong, China; 4. Xianhe Oil Production Plant, Shengli Oilfield Branch Company, SINOPEC, Dongying 257000, Shandong, China)

关键词:

油气藏;  油气相态;  PVT模拟;  天然气成因;  金刚烷;  蒸发分馏;  流体包裹体;  东营凹陷

Keywords:

petroleum reservoir;  petroleum phase;  PVT simulation;  gas genesis;  diamondoid;  evaporative fractionation;  fluid inclusion;  Dongying depression

分类号:

P618.13; TE122

DOI:

10.19814/j.jese.2021.11041

文献标志码:

A

摘要:

近年来东营凹陷北带古近系沙四下亚段深层发现大量的轻质油气藏,其油气相态特征和成藏模式还缺乏深入认识。通过对油气地球化学、流体包裹体和埋藏史-热演化史等的研究,结合原油裂解实验产物和沙四下亚段深部储层中油气PVT模拟,对该地区深部油气成因、相态演化和成藏模式进行了探讨。结果表明:随着原油裂解程度的增加,临界凝析温度逐渐降低; 在较高压力(20 MPa)条件下,重烃气组分裂解受到抑制,流体组分中甲烷摩尔分数降低,流体包络线的临界凝析压力降低,并呈非线性波动变化。天然气组分和碳同位素特征显示,天然气成熟度参数镜质体反射率(R_o)介于0.9%～1.5%,所检测的天然气样品为原油裂解气和干酪根降解气混合成因。原油中检测到的金刚烷及甾烷等绝对含量表明,所检测的深部原油样品处于高成熟状态,但仍处于裂解早期阶段,原油裂解气为凹陷深部的异地原油裂解向上运移而来。埋藏史、热演化史模拟和储层中流体包裹体均一温度表明,FS2井沙四下亚段储层主要存在两期油气充注,分别为沙三段沉积末期的原油(含干酪根降解气)充注和明化镇组沉积早期来自深部储层的原油裂解气充注。晚期高成熟原油裂解气充注引起了蒸发分馏和气洗作用,这是该地区深层轻质油藏形成的一个重要原因,最终形成了次生未饱和的凝析气藏和挥发性油藏。

Abstract:

Numerous light oil reserves in the lower sub-member of the fourth member of Paleogene Shahejie Formation(Es^L₄)have been found in Dongying depression, Bohai Bay Basin. The characteristics of their phases and accumulation models are not well understood. The genesis, phase evolution, and accumulation models of deep petroleum in this area were studied by petroleum geochemistry, fluid inclusions, burial history, and thermal history, as well as PVT simulation on the products of crude oil cracking experiments and the Es^L₄ petroleum. The results show that as the degree of oil cracking increases, the cricondentherm decreases; the cracking of heavy hydrocarbon gas is inhibited at high pressure(20 MPa), resulting in the decrease of CH₄ mole fraction and the cricondenbar of the fluid envelope, and the nonlinear fluctuation of cricondenbar. The composition and carbon isotope characteristics of natural gas show that the maturity(R_o)of natural gas samples ranges from 0.9% to 1.5%; the natural gas samples are mixed with crude oil cracking gas and kerogen degradation gas. The absolute contents of steranes and diamantanes in the oil samples indicate that they are highly mature yet still in the early cracking stage; the oil cracking gas migrates upward along faults from the remote deep place in the depression. There are mainly two stages of hydrocarbon charging in the Es^L₄ reservoirs in well FS2, including crude oil(containing kerogen degradation gas)charging in the late deposition of the third member of Shahejie Formation and oil cracking gas charging in the early deposition of Minghuazhen Formation. Evaporative fractionation and gas washing caused by late high maturity oil cracking gas charging are crucial factors for the formation of deep light oil reservoirs, which eventually result in the formation of secondary unsaturated condensate gas reservoirs and volatile oil reservoirs.

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备注/Memo

备注/Memo:

收稿日期:2021-11-22; 修回日期:2022-02-22
基金项目:国家自然科学基金项目(U1762217)
作者简介:乔荣臻(1996-),男,山东烟台人,工学硕士研究生,E-mail:qiaorongzhen123@163.com。
*通讯作者:陈中红(1976-),男,安徽怀宁人,中国石油大学(华东)教授,博士研究生导师,工学博士,E-mail:hongczh@163.com。

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