松辽盆地南部长岭断陷火成岩分布及成藏规律

Pattern of igneous rock distribution and hydrocarbon accumulation in Changling fault depression of the south part of Songliao Basin

中国石化新星石油公司华东石油局第六物探大队, 江苏南京 210007

The Sixth Geophysical Prospecting Party of East China Petrcleum Bureau, SINOPEC Star Petroleum Exploration & Production Company, Nanjing 210007, China

长岭断陷为陆相火山岩一沉积岩盆地,断裂运动是控制火山活动及火山岩平面分布的主要因素。通过对该区多年的研究,利用特殊地震相,对火山岩平面分布进行预测,圈出2个火山口和8个沿控边大断裂分布的火山岩体,并在营城组火山岩体中获得工业性天然气。火山岩储集层物性的好坏,除受原生孔隙控制外,次生裂隙及溶洞也是关键因素,寻找断裂发育带和后期反转区内的火山岩有利储集相带,是寻找深层天然气和无机气的有利场所。

Changling fault depression is a basin of continental volcanic-sedimentary rocks, faulting is the key factor that controls volcanic activities and volcanic rock distribution. Based on investigations over this region, the author inferred the distribution of volcanic rocks, and delineated 2 craters and 8 volcanic massifs distributed along major ruptures with special seismic fades. Commercial natural gas was discovered in the volcanic massif of Yingcheng Formation. In addition to in-situ pores, the physical properties of volcanic rock reservoirs are also affected by secondary fractures and caves. Seeking favorable hydrocarbon accumulation zones of volcanic rocks in fault zones and succeeding reversal zones are exactly equal to seek the favorable locations of deep natural gas and inorganic gas.