多环芳烃与非烃地球化学：油藏充注途径的示踪标志

发布时间：2018-12-13 02:26

【摘要】：含硫多环芳烃(二苯并噻吩、苯并萘并噻吩)是石油和沉积有机质中一类重要的含杂原子多环芳烃化合物。由于其高电负性和硫原子外环存在一对未成键的孤对电子,所以硫原子和疏导介质中的氢原子可以形成氢键。因此二苯并噻吩类及苯并萘并噻吩参数可以作为有效的分子示踪参数。本论文所研究的哈拉哈塘凹陷位于塔里木盆地塔北隆起中部,勘探前景良好。通过精细的剖析该地区典型原油的地球化学特征,进行油-油对比的研究,进而划分原油族群,在此基础上,研究典型油藏的成藏期次与时间,选定示踪油藏运移的分子参数,示踪油气藏的运移方向与路径。并结合典型油藏的地质条件,对研究区的油气运移方向、充注途径和成藏特征进行综合分析。本次论文共采集了哈拉哈塘及周缘地区共78口井80件奥陶系原油样品,通过对这些原油样品进行的地球化学分析研究,发现哈拉哈塘凹陷奥陶系油藏的原油样品属于同一原油族群,并与周缘塔河油田样品具有很好的对比性。表明该地区奥陶系原油源自于同一烃源层/灶,并且具有相似的充注/成藏历史。通过对3口典型井的储层包裹体观测和测温、结合一维数值模拟重建的单井地层埋藏史-热历史曲线,确定哈拉哈塘地区奥陶系油藏存在着两期成藏,相应的成藏时间为:第一期420~410Ma,相当于中—晚志留世;第二期成藏时间为20~6Ma,相当于中新世时期。利用筛选出的二苯并噻吩类含硫多环芳烃分子参数(4-/1-甲基二苯并噻吩,4,6-/(1,4+1,6)-二甲基二苯并噻吩,(2,6+3,6)-/(1,4+1,6)-二甲基二苯并噻吩,2,4,6-/(1,4,6+1,4,8+3,4,6)-三甲基二苯并噻吩,(2,4,7+2,4,8)-/(1,4,6+1,4,8+3,4,6)-三甲基二苯并噻吩及苯并萘并噻吩参数)对哈拉哈塘及周缘托甫台、艾丁及跃进区块奥陶系油藏进行了连片示踪,结果表明该区奥陶系油藏整体由南向北运移,推测出该地区烃源灶位于哈拉哈塘凹陷南部的满西低凸起上。并结合该地区的油气运移方向、优势运移通道与缝洞发育情况,原油的产量分布情况之间的关系,发现分子地球化学参数示踪得到的优势运移通道均位于缝洞系统上,且优势运移通道上均为油气产量的高产区。通过对分子地球化学示踪参数结合地质特征、油藏分布特征综合分析,推断出哈拉哈塘凹陷南部区域可能是进一步油气勘探的指向区。
[Abstract]:Polycyclic aromatic hydrocarbons (PAHs) containing sulfur (dibenzothiophene, benzonaphthalene) are an important class of hetero-atomic polycyclic aromatic hydrocarbons (PAHs) in petroleum and sedimentary organic matter. Because of its high electronegativity and the existence of a pair of unbonded lone electrons in the outer ring of sulfur atoms, the hydrogen atoms of sulfur atoms and hydrophobic media can form hydrogen bonds. Therefore, the parameters of dibenzothiophene and benzonaphthalene can be used as effective molecular tracer parameters. The halahatang sag studied in this paper is located in the middle of Tarim Basin and has a good prospect of exploration. Through the detailed analysis of the geochemical characteristics of typical crude oil in this area and the study of oil-oil correlation, the oil population is further divided. On the basis of this, the time and time of reservoir formation are studied, and the molecular parameters of migration of tracer reservoir are selected. Migration direction and path of tracer reservoirs. Combined with the geological conditions of typical reservoirs, the oil and gas migration direction, filling path and reservoir forming characteristics in the study area are comprehensively analyzed. In this paper, a total of 80 samples of Ordovician crude oil from 78 wells in Hara Hattang and its surrounding areas were collected and studied through geochemical analysis of these crude oil samples. It is found that the crude oil samples of Ordovician reservoirs in Hala Hattang Sag belong to the same crude oil group and have a good comparison with the samples from the surrounding Tahe Oilfield. It is shown that the Ordovician crude oil in this area originated from the same hydrocarbon source bed / stove and has a similar history of filling / reservoir formation. Based on the observation and temperature measurement of reservoir inclusions in three typical wells, combined with one-dimensional numerical simulation reconstruction of single well burial history and thermal history curve, it is determined that there are two periods of reservoir formation in Ordovician reservoir in Hala Hattang area. The corresponding time of reservoir formation is as follows: the first period 420 ~ (10) Ma, equivalent to the Middle and late Silurian; The second stage of reservoir formation is 20 ~ 6 Ma, which is equivalent to the Miocene period. The molecular parameters of dibenzothiophene containing sulfur polycyclic aromatic hydrocarbons (4 / 1-methyldibenzothiophene, 4o 6 / (1o 41N 6) -dimethyl dibenzothiophene, (2n 63N 6)-/ (1n 4 1n 6) -dimethyl dibenzothiophene, 24H, 24N, 24N, 24N) were obtained by using the selected molecular parameters of dibenzothiophene sulfur containing polycyclic aromatic hydrocarbons (4 / 1-methyldibenzothiophene, 4- / (1-) -dimethyldibenzothiophene). The effects of 6 / (1 / (1 / 4) (1 / 4) 4 / (1 / (1 / 4) 4 / (1 / (1 / 4) 4 / 6)-trimethyldibenzothiophene and benzonaphthalenothiophene parameters) on Haradang and its peripheral Tofu platform were studied. The Ordovician reservoirs in Aiding and Yuejin blocks have been followed by successive tracers. The results show that the Ordovician reservoirs in this area are migrated from south to north, and it is inferred that the hydrocarbon source ranges in this area are located on the low uplift of the southern part of the Hala Hattang Sag. Combined with the relationship between the migration direction of oil and gas, the development of dominant migration channels and the development of fracture and cave, and the distribution of crude oil production, it is found that the dominant migration channels obtained by tracing molecular geochemical parameters are located in the system of fractures and cavities. And the high yield area of oil and gas is located on the dominant migration channel. Based on the comprehensive analysis of the molecular geochemical tracer parameters combined with geological characteristics and reservoir distribution characteristics, it is inferred that the southern region of the Hala Hattang depression may be the direction of further oil and gas exploration.
【学位授予单位】：中国石油大学(北京)
【学位级别】：博士
【学位授予年份】：2016
【分类号】：P618.13

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