珠江口盆地白云凹陷原油半开放条件下裂解成气模拟实验

龙祖烈; 石创; 朱俊章; 黄玉平; 史玉玲; 张小龙

doi:10.11781/sysydz202103507

珠江口盆地白云凹陷原油半开放条件下裂解成气模拟实验

doi: 10.11781/sysydz202103507

龙祖烈^{1, 2,},
石创^{1, 2},
朱俊章^{1, 2},
黄玉平^{1, 2},
史玉玲^{1, 2},
张小龙^{1, 2}

1.
中海石油深海开发有限公司, 广东深圳 518054
2.
中海石油(中国)有限公司深圳分公司, 广东深圳 518054

基金项目:

国家科技重大专项“珠江口盆地深水区古温压演化与油气生排聚过程” 2016ZX05026-003-006

详细信息

作者简介:
龙祖烈(1983-), 男, 硕士, 工程师, 从事油气田勘探开发研究。E-mail: longzl@cnooc.com.cn

中图分类号: TE135
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- 文章访问数: 363
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- 被引次数: 0
出版历程
- 收稿日期: 2020-10-27
- 修回日期: 2021-04-12
- 刊出日期: 2021-05-28

Simulation of crude oil cracking and gas generation with semi-open condition, Baiyun Sag, Pearl River Mouth Basin

LONG Zulie^{1, 2
,},
SHI Chuang^{1, 2},
ZHU Junzhang^{1, 2},
HUANG Yuping^{1, 2},
SHI Yuling^{1, 2},
ZHANG Xiaolong^{1, 2}

1.
CNOOC Deepwater Development Limited, Shenzhen, Guangdong 518054, China
2.
Shenzhen Branch of CNOOC Limited, Shenzhen, Guangdong 518054, China

摘要

摘要: 为深入研究珠江口盆地白云凹陷原油裂解机制及产物变化特征，选取了白云凹陷渐新统珠海组原油样品，利用高温高压模拟实验，模拟了地下压力、地下流体介质及半开放条件下、不同升温速率的原油裂解过程，分析了气产率和气体组分特征。研究表明，原油样品在365℃开始裂解，裂解产率随温度增加而增加，在20℃/h的升温速率下，最终（550℃）裂解气体产率、烃气产率和非烃气体产率分别为580.13，394.25，185.88 mg/g；而在60℃/h的升温速率下，最终（550℃）裂解气体产率、烃气产率和非烃气体产率分别为707.68，485.77，221.91 mg/g。不同升温速率下最终产率的差异和烃气的组分差异均与不同温度下原油裂解机制差异有关。从原油裂解成气模拟实验的组分特征来看，大部分原油裂解气具有较高的重烃气含量，而较高重烃含量可作为判识原油裂解气和干酪根裂解气的辅助指标。
- 原油裂解 /
- 裂解模拟实验 /
- 半开放体系 /
- 裂解气产率 /
- 天然气 /
- 珠海组 /
- 白云凹陷 /
- 珠江口盆地
Abstract: In order to study the mechanism and product compositions of oil cracking, crude oil samples from the Zhuhai Formation of the Baiyun Sag of Pearl River Mouth Basin were carried out for the high-temperature, high-pressure pyrolysis with different heating rates with the pressure close to the conditions of underground. The underground fluid was also considered to be included with a semi-open condition for the pyrolysis, the gas yields and gas composition characteristics were then analyzed. Results showed that crude oils start to crack at 365 ℃, and the cracking yield increases with the increase of temperature. At a heating rate of 20 ℃/h, the final yields (at 550 ℃) of pyrolysis gas, hydrocarbon gas and non-hydrocarbon gas were 580.13, 394.25, and 185.88 mg/g, while at a heating rate of 60 ℃/h, these values increased to 707.68, 485.77, 221.91 mg/g, respectively. The composition of hydrocarbon gases at different heating rates also varied, and these variations were assumed to be related to the difference of cracking mechanisms of crude oils at different temperatures of pyrolysis. According to the composition characteristics of pyrolytic gas products, most of the gases from crude oil cracking has a relative higher content of high molecular weight hydrocarbon gas, thus these compounds can be used as an auxiliary index to distinguish crude oil cracked gas from kerogen cracked gas.
- crude oil pyrolysis /
- pyrolysis simulation experiment /
- semi-open system /
- pyrolysis gas yield /
- natural gas /
- Zhuhai Formation /
- Baiyun Sag /
- Pearl River Mouth Basin

HTML全文

图 1 原油裂解模拟实验装置流程

Figure 1. Experimental device for crude oil cracking simulation

下载: 全尺寸图片幻灯片

图 2 珠江口盆地白云凹陷LH16井原油样品裂解烃气产率曲线

Figure 2. Cracked hydrocarbon gas yield curves of crude oil samples from well LH16, Baiyun Sag, Pearl River Mouth Basin

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图 3 珠江口盆地白云凹陷LH16井原油在不同裂解温度下的气体组成

Figure 3. Gas composition at different cracking temperatures of oil samples from well LH16, Baiyun Sag, Pearl River Mouth Basin

下载: 全尺寸图片幻灯片

表 1 原油高温高压裂解模拟实验条件

Table 1. Conditions for simulation experiments of crude oil high temperature and high pressure cracking

实验步骤	温度/℃	流体压力/MPa	静岩压力/MPa
模拟点1	250	25	60
模拟点2	300	30	72
模拟点3	335	33	79
模拟点4	365	35	84
模拟点5	400	38	91
模拟点6	450	40	96
模拟点7	500	43	103
模拟点8	550	45	108

下载: 导出CSV

表 2 珠江口盆地白云凹陷LH16井原油裂解气体产率数据

Table 2. Cracked gas yields of crude oil samples from well LH16, Baiyun Sag, Pearl River Mouth Basin

升温速率/(℃·h^-1)	温度/℃	总气体产率/(mg·g^-1)	烃气产率(mg·g^-1)						非烃气产率/(mg·g^-1)	非烃气占比/%
升温速率/(℃·h^-1)	温度/℃	总气体产率/(mg·g^-1)	C₁	C₂	C₃	C₁－C₅	C₂－C₅	C₃－C₅	非烃气产率/(mg·g^-1)	非烃气占比/%
20	335	-	-	-	-	-	-	-	-	-
	365	12.09	0.10	0.08	0.14	0.44	0.34	0.26	11.65	96.36
	400	169.21	13.53	30.43	45.96	144.09	130.56	100.13	25.12	14.85
	450	358.71	53.30	82.64	98.85	291.28	237.98	155.34	67.43	18.80
	500	571.15	114.60	163.50	90.65	460.50	345.90	182.40	110.65	19.37
	550	580.13	120.51	166.75	49.33	394.25	273.74	106.99	185.88	32.04
60	335	-	-	-	-	-	-	-	-	-
	365	26.73	3.43	3.71	5.39	16.70	13.27	9.56	10.03	37.52
	400	159.60	24.00	11.74	22.96	84.70	60.70	48.96	74.90	46.93
	450	213.36	31.11	46.03	53.36	154.15	123.04	77.01	59.21	27.75
	500	483.63	86.34	124.49	70.31	344.17	257.83	133.34	139.46	28.84
	550	707.68	164.84	198.20	60.28	485.77	320.93	122.73	221.91	31.36

下载: 导出CSV

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