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辽河坳陷西部凹陷是中国东部油气资源丰度最高的地质单元之一,目前已产出大量原油,但天然气勘探研究相对薄弱。为此,根据地质条件及其变化关系分析,并侧重油气分布地质规律认识,将该坳陷西部凹陷划分为各自特征明显的4个油气成藏体系,分别是北部陡坡带、西部斜坡带、中部断背斜带和南部陡坡带成藏体系。各成藏体系的形成演化及含油气地质特点与西部凹陷的沉降—沉积中心由北向南、由西向东的迁移特点密切相关,有机质的生烃能力、油气的富集程度以及天然气的聚集丰度均受制于这一地质过程。作为多因素地质作用的结果,油气分布具有顺层、近源、受层系控制的成藏及分布模式,天然气分布主要出现在各成藏体系中靠近洼陷中心的地方,环绕鸳鸯沟、清水、盘山等南部洼陷,形成了天然气分布的环圈状特点,沉降—沉积中心的迁移和成藏体系的展布控制了该区天然气的空间分布。
The western sag of Liaohe Depression is one of the geological units with the highest oil and gas resource abundance in eastern China. At present, a large amount of crude oil has been produced, but the research on natural gas exploration is relatively weak. Therefore, based on the analysis of the geological conditions and their changes, and focusing on the understanding of the geologic rules of oil and gas distribution, the western sag of the depression is divided into four distinct hydrocarbon accumulation systems with distinctive characteristics, namely, the northern steep slope belt, the western slope belt, Broken back syncline and southern steep slope belt accumulation system. The evolution and hydrocarbon-bearing geological characteristics of each reservoir system are closely related to the migratory characteristics of the sedimentation-sedimentary center in the western depression from north to south and from west to east. The hydrocarbon generation capacity of organic matter, the degree of hydrocarbon accumulation, and the abundance of natural gas Are subject to this geological process. As a result of the multi-factor geological process, the distribution of oil and gas has the mode of accumulation and distribution controlled by layers, near sources and layers. The distribution of natural gas mainly occurs near the center of the depression in each reservoir system, , Panshan and other southern depressions, formed a ring-shaped distribution of natural gas characteristics, sedimentation - sedimentation center migration and the accumulation of reservoir system to control the distribution of natural gas in this area.