礁滩相地震响应特征和油气勘探远景

Seismic response characteristic and hydrocarbon exploration perspec- tive of reef flat fades

1. 中国地震局地质研究所，北京100021;2. 中国石油化工股份有限公司南方勘探开发分公司，云南昆明650200;3. 中国石油化工股份有限公司西南分公司，四川德阳618000

Geology Institute of Earthquake Administration of China. Beijing 100021,China

长兴组礁滩相储层在川东北地区广泛分布,含气量丰富,但生物礁储层预测一直是油气勘探的难点,发现生物礁的钻井多数为随机钻遇的。为此,利用高分辨率高信噪比地震资料,采用从已知气田预测模式入手对未知区域进行分析的方法,对长兴期礁滩相的分布状态进行了预测。首先对研究区的构造和沉积背景进行了描述,对长兴组礁滩相地震响应特征进行了分析;然后通过解剖普光气田长兴组礁滩相的地震响应特征和层序地层学特征,确立了礁滩相储层预测方法,重点对通南巴构造和通南巴构造带-九龙山构造南侧的礁滩相层序地层特征和地震响应特征进行了分析,预测了这2个构造的礁滩相分布区,评价了礁滩相的油气勘探远景。

The reef flat facies reservoir of Changxing formation is widely distributed in the southwest Sichuan province and is abundant in gas. However, the forecast of reef reservoir is always a difficult thing in hydrocarbon exploration and most of the wells in which the reef is found by accident. Aiming at this problem, the distribution of reef flat facies reservoir in Changxing stage is forecast based on the high signal-to-noise ratio seismic data and the known gas field forecast model First, structure and depositional setting of the area are described and response characteristic of the reef flat facies reservoir of Changxing formation is analyzed; then, through analyzing seismic response characteristic and sequence stratigraphy feature of the reef flat facies reservoir of Changxing formation in Puguang oilfield, the methods of forecasting reef flat facies reservoir is established and the seismic response characteristic and sequence stratigraphy feature of reef flat facies reservoir in Tongnanba structure and in Tongnanba structure belt-the south of the Jiulongshan structure are specially analyzed. On the basis of this, the distribution of reef flat facies of these two geological structures is predicted. Finally, the hydrocarbon exploration perspective is evaluated.