松辽盆地南部断陷层碎屑岩天然气成藏主控因素分析——以长岭断陷龙凤山次凹为例

摘要/Abstract

摘要： 以松辽盆地南部长岭断陷龙凤山次凹为例，通过对烃源岩、储层、盖层及成藏输导匹配等成藏条件进行分析，认为长岭断陷具备良好的生、储、盖等基本石油地质条件，发育断裂—砂体的垂向和侧向双重输导体系，深层构造定型时间早于主成藏期，有利于油气运移聚集成藏。长岭断陷营城组碎屑岩天然气成藏主要有4个基本控制因素：深洼区沙河子组及营城组烃源岩质量及热演化程度控制了油气源条件；优势沉积微相控制有利砂体分布，储层物性决定了油气富集程度，次生孔隙发育对含气性贡献较大；营城组上部稳定的泥岩盖层与晚期断裂的组合控制保存条件，决定了油气主要富集层系；成藏期构造背景下断裂—砂体输导体系有效性控制了油气运移方向。研究认为，长岭断陷层碎屑岩领域具有“洼陷区供烃、断裂—砂体双重输导、构造—盖层控制聚集”的天然气成藏模式。

关键词: 松辽盆地南部, 长岭断陷, 龙凤山次凹, 碎屑岩, 天然气, 成藏条件, 主控因素

Abstract: Taking the Longfengshan sub-sag in the Changling fault depression, southern Songliao Basin, as an example, this paper discussed the hydrocarbon accumulation conditions, including source rock, reservoir, cap rock, and hydrocarbon migration and preservation. It is considered that the Changling fault depression has the basic petroleum geological conditions for hydrocarbon accumulation, with both vertical and lateral pathway system constituted by fault and sandbodies. Furthermore, deep structure was shaped earlier than the main hydrocarbon accumulation stage, which is favorable for hydrocarbon migration and preservation. There are four main controlling factors for gas accumulation in the Yingcheng Formation clastic rocks in the Changling fault depression. First, quality and thermal evolution degree of the Shahezi Formation and Yingcheng Formation source rocks in deep sags controlled the oil and gas source supply. Second, predominant sedimentary microfacies controlled the distribution of favorable sandbodies while reservoir properties determined the hydrocarbon enrichment degree, and presence of secondary pores significantly contributed to the gas-bearing potential. Third, the stable mudstone cap rock in the upper Yingcheng Formation and the faults developed in late stage controlled the preservation conditions and determined the major hydrocarbon-rich strata. And fourth, the fault-sandbody pathway system formed under the structural setting in hydrocarbon accumulation stage effectively controlled the oil and gas migration direction. Study in this paper suggests that the clastic rocks in the Changling fault depression have a gas accumulation pattern of “source supply from deep sag, conduction via a vertical and lateral fault-sandbody pathway system, and structure-cap- rock controlling hydrocarbon accumulation”.

Key words: southern Songliao Basin, Changling fault depression, Longfengshan sub-sag, clastic rocks, gas, hydrocarbon accumulation conditions, main controlling factors

秦都, 黄桂雄, 李瑞磊, 朱建峰, 陈杏霞, 徐文. 松辽盆地南部断陷层碎屑岩天然气成藏主控因素分析——以长岭断陷龙凤山次凹为例[J]. 中国石油勘探, 2016, 21(3): 52-61.

Qin Du, Huang Guixiong, Li Ruilei, Zhu Jianfeng, Chen Xingxia, Xu Wen. Main controlling factors for gas accumulation in clastic rocks in fault depression, southern Songliao Basin: a case study on Longfengshan sub-sag, Changling fault depression[J]. China Petroleum Exploration, 2016, 21(3): 52-61.

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