综合利用钻井岩心、测录井、试油等资料,通过岩心观察、薄片鉴定、物性测试、流体包裹体分析等技术方法,对牛庄洼陷沙三中亚段浊积岩储层特征、油气分布特征进行研究,总结油气富集规律。牛庄洼陷沙三中亚段浊积岩储层主要为岩屑质长石砂岩,以细砂岩为主,主要发育中高孔低渗特低渗透储层,储集空间类型以原生孔隙为主,次生孔隙较发育;压实作用中等,碳酸盐胶结为主,硅质胶结较发育,长石溶蚀最为常见。储层含油性与物性之间没有明显的对应关系,而是受埋深、地层压力和储层物性的综合控制。平面上油层围绕生烃中心和油源断层呈环带式分布,地层压力高值区与油源断层发育区是油气富集的有利场所。油气富集受烃源岩与储层的空间配置和烃源岩热演化与储层物性演化时间上的配置决定,不同埋深浅部储层不含油,深部储层易含油;相同埋深低物性储层不含油,高物性储层易含油;断层和地层超压发育区储层易含油。
The characteristics of turbidite reservoir and oil and gas distribution and enrichment pattern in the middle of third member Shahejie formation in Niuzhuang sub-sag have been investigated through core observation, thin section identification, property test and fluid inclusion analysis using drilling core, logging and oil testing data. The turbidite reservoirs in the study area are mainly lithic arkoses, containing fine sandstone, with middle-high porosity and low permeability. The space types in the reservoir are mainly primary pores, and secondary pores also develop, with moderate compaction dominated by carbonate cementation and siliceous cementation in the secondary place, and feldspar dissolution is the most common dissolution. The oil content has no apparent corresponding relationships with physical properties of the reservoir, but is controlled comprehensively by buried depth, formation pressure and physical properties of the reservoir. In plane, oil layers have a ring type distribution around hydrocarbon generation center and oil source fault, and areas with high formation pressure and oil source fault development are the favorable places for oil and gas enrichment. Oil and gas accumulation is determined by the spatial allocation relationship of hydrocarbon source rocks and reservoirs, and the timing allocation relationship of thermal evolution of hydrocarbon source rock and physical evolution of the reservoir. Reservoirs of shallow buried depth are oil-free, whereas those in deep areas tend to be oily. Reservoirs of similar buried depth tend to be oil-free in areas with poor physical properties and oil-rich in areas with good physical properties, and oil is likely to accumulate in fault-abundant and overpressured formation areas.
[1] 李丕龙, 庞雄奇, 陈冬霞, 等. 济阳坳陷砂岩透镜体油藏成因机理与模 式[J]. 中国科学: D辑, 2004, 34(增1): 143-151. Li Peilong, Pang Xiongqi, Chen Dongxia, et al. Hydrocarbon accumulation conditions and model of lenticular sandbody reservoirs in the Jiyang depression[J]. Science in China: Series D, 2004, 34(Suppl 1): 143-151.
[2] 郝雪峰. 古油势和低序次断层与砂岩透镜体圈闭含油性的关系—— 以东营凹陷牛庄洼陷沙三段中亚段为例[J]. 油气地质与采收率, 2012, 19(3): 6-10. Hao Xuefeng. Relationship between paleo- fluid potential and subseismic faults and hydrocarbon saturation in lenticular sand body traps: Case of lithological reservoirs in Niuzhuang sag, Dongying depression [J]. Petroleum Geology and Recovery Efficiency, 2012, 19(3): 6-10.
[3] 张鹏飞. 东营凹陷洼陷带沙三中亚段浊积岩成藏条件分析[J]. 岩性油 气藏, 2012, 24(3): 61-65. Zhang Pengfei. Hydrocarbon accumulation conditions of turbidite in the middle sub-member of the third member of Shahejie formation in subdepression belt of Dongying sag[J]. Lithologic Reservoirs, 2012, 24(3): 61-65.
[4] 刘明洁, 刘震, 王标, 等. 成藏期砂岩孔隙度对油气分布的控制作 用——以东营凹陷牛庄洼陷沙三中亚段岩性油藏为例[J]. 地质科学, 2014, 49(1): 147-160. Liu Mingjie, Liu Zhen, Wang Biao, et al. The controls of sandstone paleo- porosity in accumulation period to hydrocarbon distribution: A case study from Es3Mid in Niuzhuang sag, Dongying depression[J]. Chinese Journal of Geology, 2014, 49(1): 147-160.
[5] 张善文, 曾溅辉, 肖焕钦, 等. 济阳坳陷岩性油气藏充满度大小及分布 特征[J]. 地质论评, 2004, 50(5): 365-369. Zhang Shanwen, Zeng Jianhui, Xiao Huanqin, et al. Oil-gas filling degree and distribution characteristics of the lithological oil-gas reservoir in the Jiyang depression[J]. Geological Review, 2004, 50(5): 365-369.
[6] 庞雄奇, 陈冬霞, 姜振学, 等. 隐伏砂岩透镜体成藏动力学机制与基本 模式[J]. 石油与天然气地质, 2007, 28(2): 216-228. Pang Xiongqi, Chen Dongxia, Jiang Zhenxue, et al. Mechanism and basic modes of petroleum accumulation dynamics in subtle sandlens reservoir[J]. Oil & Gas Geology, 2007, 28(2): 216-228.
[7] 李虎山,吴云桐,吕义军,等. 牛庄地区沙三段远岸浊积扇发育与分布 规律[J]. 油气地质与采收率, 2003, 10(2): 11-13. Li Hushan, Wu Yuntong, Lü Yijun, et al. Development and distribution rule of far bank turbidite fan in Es3 of Niuzhuang area[J]. Petroleum Geology and Recovery Efficiency, 2003, 10(2): 11-13.
[8] 蔡李梅, 陈红汉, 李纯泉, 等. 济阳坳陷东营凹陷沙三中亚段流体包裹 体古流体势场恢复[J]. 石油与天然气地质, 2009, 30(1): 17-25. Cai Limei, Chen Honghan, Li Chunquan, et al. Reconstruction of the paleo-f luid potential field of Es3 in the Dongying sag of the Jiyang depression with systematic fluid inclusion analysis[J]. Oil & Gas Geology, 2009, 30(1): 17-25.
[9] 陈冬霞, 庞雄奇, 邱楠生, 等. 砂岩透镜体成藏机理[J]. 地球科学, 2004, 29(4): 3-12. Chen Dongxia, Pang Xiongqi, Qiu Nansheng, et al. Accumulation and filling mechanism of lenticular sandbody reservoirs[J]. Earth Science, 2004, 29(4): 3-12.
[10] Giles M R, De Boer R B. Origin and significance of redistributional secondary porosity[J]. Marine and Petroleum Geology, 1990, 7(4): 378- 397.
[11] 漆滨汶, 林春明, 邱桂强, 等. 山东省牛庄洼陷古近系沙河街组沙三 中亚段储集层成岩作用研究[J]. 沉积学报, 2007, 25(1): 99-109. Qi Binwen, Lin Chunming, Qiu Guiqiang, et al. Reservoir diagenesis of the intermediate section in member 3 of Shahejie Formation (Paleogene) in Niuzhuang sub- sag, Shandong Province[J]. Acta Sedimentologica Sinica, 2007, 25(1): 99-109.
[12] Surdam R C, Crossey L J, Hagen S E, et al. Organie-inorganic interactions and sandstone diagenesis[J]. AAPG Bulletin, 1989, 73(1): 1-12.
[13] 王艳忠. 东营凹陷北带古近系次生孔隙度发育带成因机制及演化模 式[D]. 青岛: 中国石油大学(华东), 2010. Wang Yanzhong. Genetic mechanism and evolution model of secondary pore development zone of paleogene in the north zone in Dongying depression[D]. Qingdao: China University of Petroleum, 2010.
[14] 漆滨汶, 林春明, 邱桂强, 等. 东营凹陷古近系沙河街组砂岩透镜体 钙质结壳形成机理及其对油气成藏的影响[J]. 古地理学报, 2006, 8 (4): 519-530. Qi Binwen, Lin Chunming, Qiu Guiqiang, et al. Formation mechanism of calcareous incrustation in lenticular sandbody of the Shahejie formation of paleogene and its influence on hydrocarbon accumulation in Dongying sag[J]. Journal of Palaeogeography, 2006, 8(4): 519-530.
