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万安盆地存在有基岩潜山型油气藏、断块型油气藏、生物礁岩隆型油气藏和背斜型油气藏四大类型。在纵向上,油气产出的层位主要为中新统砂岩,其次为中～上中新统碳酸盐岩或礁灰岩和渐新统砂岩,个别见于基岩储层。在横向上,油气藏主要分布于西北断阶带、北部隆起、中部坳陷和中部隆起,少数含油气构造分布于西部坳陷,而在南部坳陷和东部隆起上仅见油气显示。据研究,万安盆地发育了渐新统-中新统含油气系统,并根据其地质要素和地质作用差异,进一步划分为两个亚含油气系统:万安中、北部亚含油气系统和万安南部亚含油气系统。研究表明,盆地的油气分布特征明显地受含油气系统的特征和性质所控制。
There are four types of bedrock buried hill reservoirs, fault block reservoirs, bioherm rock-fill reservoirs and anticline reservoirs in Wan’an basin. In the longitudinal direction, the layers of oil and gas production are mainly Miocene sandstone, followed by Middle-Upper Miocene carbonate rock, reef limestone and Oligocene sandstone, some of which are found in bedrock reservoirs. Laterally, the oil and gas reservoirs are mainly distributed in the northwestern fault zone, uplifted in the north, central depression and uplifted in the central part. A few oil and gas structures are distributed in the western depression, while only oil and gas show up in the southern depression and the eastern uplift. According to the study, the evolution of the Oligocene-Miocene petroliferous system in the Wan’an basin is further divided into two sub-petroliferous systems: the Wan-an-medium and northern sub-petroliferous systems and the 10,000- Annan sub-petroliferous system. Research shows that the distribution characteristics of oil and gas in the basin are obviously controlled by the characteristics and properties of petroleum-bearing systems.