Formation mechanism of high-quality reservoirs in deep strata of Paleogene, Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
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摘要: 随着勘探程度的提高，渤海湾盆地渤南洼陷油气勘探的主要对象逐渐由中浅层转向中深层。深层勘探的关键问题是优质储层，其发育取决于沉积充填和地层流体的相互作用。古近系沙河街组四段沉积时期，该区发育了咸化环境湖相碎屑岩与膏盐层沉积。利用钻井、实验等基础资料，分析储层沉积环境、地层水特征、岩石学特征及成岩作用类型，探讨深层优质储层发育演化机制。研究结果表明：(1)在分布面积广、沉积厚度大的膏盐层的封闭下，咸化湖泊环境的沙四段碎屑岩，早成岩期经历了碱性成岩环境，形成的碳酸盐胶结物充填原生孔隙，并有效阻滞压实作用的发生；(2)随着烃源岩中的有机质趋于成熟，中成岩期有机酸在异常高压的驱动下向地层中运移，早期碳酸盐胶结物以及长石、岩屑普遍被溶蚀，形成次生孔隙，酸碱交替作用是深层优质储层发育的主要机制；(3)优质储层的发育受到膏盐层分布、烃源岩发育、断裂体系与碎屑沉积体展布的控制，受酸碱流体影响强烈的缓坡扇三角洲和陡坡近岸水下扇中前端砂体，是渤南洼陷沙四段优质储层发育区。Abstract: With the continuous improvement of exploration degree, the main object for oil and gas exploration in the Bonan Subsag of Bohai Bay Basin gradually changes from medium and shallow layers to medium and deep layers. The key factor for deep exploration is the development of high-quality reservoir, which depends on the interaction between sedimentary filling and formation fluid. During the deposition of the fourth member of Paleogene Shahejie Formation, lacustrine clastic rocks and gypsum salt deposits developed in this area under a saline environment. Based on the comprehensive study of drilling data and experimental results, the sedimentary environment, formation water characteristics, reservoir petrographic characteristics and diagenetic types of the Paleogene reservoirs in the Bonan Subsag were discussed, the development and evolution mechanism of the deep and high-quality reservoirs in Paleogene was also indicated. Results show that: (1) Under the sealing of gypsum salt layer with wide distribution area and large sedimentary thickness, the clastic rocks of Es4 member in salty environment experienced alkaline diagenetic environment in the early stage. The carbonate cements formed in this period filled primary pores and effectively prevented the occurrence of compaction. (2) With the increase of the maturity of organic matters in source rocks, significant organic acid migrated to stratum driven by abnormal high pressure during the middle diagenesis stage. The early carbonate cements, feldspar and debris were generally dissolved and secondary pores were subsequently formed. Acidic and alkaline reworks are the main mechanism for the development of deep high-quality reservoirs. (3) The development of high-quality reservoirs was controlled by the distribution of gypsum salt layer, the development of source rock, fault system and the distribution of clastic sedimentary body. The front sand bodies of gentle-slope fan delta and steep-slope nearshore subaqueous fan strongly influenced by acid and alkali fluid are the high-quality reservoir development area of Es4 member in Bonan Subsag.
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Key words:
- high-quality reservoir /
- gypsum salt layer /
- source rock /
- fluid property /
- secondary pore /
- Paleogene /
- Bonan Subsag /
- Bohai Bay Basin
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图 1 渤海湾盆地沾化凹陷渤南洼陷区域构造位置
Figure 1. Structural location of Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
图 2 渤海湾盆地沾化凹陷渤南洼陷古近纪构造演化及地层柱状剖面
据李丕龙等[4]修改。
Figure 2. Structural evolution and stratigraphic column of Paleogene in Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
图 3 渤海湾盆地沾化凹陷渤南洼陷各层系地层水水型分布
Figure 3. Distribution of formation water types of each stratum in Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
图 4 渤海湾盆地沾化凹陷渤南洼陷古近系沙四上亚段碎屑岩岩石类型
Figure 4. Rock types of clastic rocks in upper section of fourth member of Paleogene Shahejie Formation, Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
图 5 渤海湾盆地沾化凹陷渤南洼陷古近系储层主要成岩作用类型及成岩现象
a.早期胶结作用强，红色方解石大量充填原生孔隙，原生孔隙所剩无几，后期溶蚀作用微弱，有少量粒间溶蚀孔发育，罗354井，2 964.9 m，5×10(-)；b.早期胶结作用强，碳酸盐胶结物大量出现，抑制压实，中后期溶蚀作用中等，产生少量粒间孔及铸模孔，义160井，3 129.29 m，5×10(-)；c.早期胶结和后期溶蚀作用都较弱，早期红色方解石胶结充填原生孔隙，后期方解石胶结物和长石、岩屑被溶蚀，产生粒间溶孔，罗802井，2 022.5 m，5×10(-)；d.后期溶蚀作用强烈，早期胶结物基本被完全溶蚀，长石、岩屑部分溶蚀，产生大量粒间、粒内溶蚀孔，罗803井，2 235.29 m，10×10(-)；e.压实作用强烈，长石、岩屑被大量溶蚀，产生较多次生孔隙，义161井，3 480.65 m，5×10(-)；f.压实作用强烈，溶蚀作用中等，粒间、粒内溶蚀孔隙发育，义东261井，4 089 m，5×10(-)
Figure 5. Types and phenomena of diagenetic effects of Paleogene reservoirs, Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
图 6 渤海湾盆地沾化凹陷渤南洼陷古近系成岩环境及成因分析
Figure 6. Diagenetic environment and genetic analysis of Paleogene in Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
图 7 渤海湾盆地沾化凹陷渤南洼陷古近系沙河街组四段碎屑岩成岩演化及储层发育模式
Figure 7. Diagenetic evolution of clastic rocks and reservoir development model of fourth member of Paleogene Shahejie Formation, Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
图 8 渤海湾盆地沾化凹陷渤南洼陷古近系沙河街组四段优质储层发育相关要素平面分布
a.膏盐层分布；b.烃源岩分布；c.断裂分布；d.砂岩分布
Figure 8. Factors related to development of high-quality reservoirs in fourth member of Paleogene Shahejie Formation, Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
表 1 渤海湾盆地沾化凹陷渤南洼陷古近系沙河街组地层水化学指标
Table 1. Hydrochemical indexes of Paleogene Shahejie Formation in Bonan Subsag, Zhanhua Sag, Bohai Bay Basin
层系 区域 矿化度/(g·L-1) 水型 钠氯系数 变质系数 脱硫系数 沙四段 渤南深洼带 10~40 CaCl2型 0.85~1 0~10 0~1 垦西斜坡带 5~20 NaHCO3型 1~1.2 ＜0 1~5，5~10 沙三段 埕南断阶带—渤南深洼带 10~40 NaHCO3型、CaCl2型 0.85~1.2 -10~10 0~1 垦西斜坡带 5~10 NaHCO3型 ＞1.2 ＜-10 1~10 沙一段 垦西斜坡带 5~10 NaHCO3型 ＞1 -10~0 1~5 
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[1] 宫秀梅, 金之钧, 曾溅辉, 等. 渤南洼陷深层油气成藏特征及主控因素[J]. 石油与天然气地质, 2005, 26(4): 473-479. doi: 10.3321/j.issn:0253-9985.2005.04.013GONG Xiumei, JIN Zhijun, ZENG Jianhui, et al. Resrvoiring characteristics and main controlling factors for deep hydrocarbon accumulations in Bonan Sag in Jiyang Depression[J]. Oil & Gas Geology, 2005, 26(4): 473-479. doi: 10.3321/j.issn:0253-9985.2005.04.013 [2] 刘雅利, 程付启, 庄嘉翠, 等. 渤南洼陷北部陡坡带砂砾岩扇体油气成藏规律[J]. 油气地质与采收率, 2010, 17(6): 23-26. doi: 10.3969/j.issn.1009-9603.2010.06.006LIU Yali, CHENG Fuqi, ZHUANG Jiacui, et al. Hydrocarbon accumulation law of conglomerate bodies on the northern steep slope in Bonan Sub-sag[J]. Petroleum Geology and Recovery Efficiency, 2010, 17(6): 23-26. doi: 10.3969/j.issn.1009-9603.2010.06.006 [3] 徐兴友, 徐国盛, 秦润森. 沾化凹陷渤南洼陷沙四段油气成藏研究[J]. 成都理工大学学报(自然科学版), 2008, 35(2): 113-120. doi: 10.3969/j.issn.1671-9727.2008.02.001XU Xingyou, XU Guosheng, QIN Runsen. Study on hydrocarbon migration and accumulation of member 4 of Shahejie Formation in Bonan Sag, Zhanhua Depression, China[J]. Journal of Chengdu University of Technology (Science & Technology Edition), 2008, 35(2): 113-120. doi: 10.3969/j.issn.1671-9727.2008.02.001 [4] 李丕龙. 陆相断陷盆地油气地质与勘探(卷二): 陆相断陷盆地沉积体系与油气分布[M]. 北京: 石油工业出版社, 2003: 52-55.LI Pilong. Petroleum geology and exploration of continental fault basin (volume 2): sedimentary system and hydrocarbon distribution of continental fault basin[M]. Beijing: Petroleum Industry Press, 2003: 52-55. [5] 朱光有, 金强, 张善文, 等. 渤南洼陷盐湖-咸水湖沉积组合及其油气聚集[J]. 矿物学报, 2004, 24(1): 25-30. doi: 10.3321/j.issn:1000-4734.2004.01.005ZHU Guangyou, JIN Qiang, ZHANG Shanwen, et al. Salt lake-saline lake sedimentary combination and petroleum accumulation in the Bonan Sag[J]. Acta Mineralogica Sinica, 2004, 24(1): 25-30. doi: 10.3321/j.issn:1000-4734.2004.01.005 [6] 武恒志. 断陷盆地砂砾岩体的发育特征: 以沾化凹陷埕南断裂带下第三系沙三段为例[J]. 石油与天然气地质, 2001, 22(1): 52-56. doi: 10.3321/j.issn:0253-9985.2001.01.012WU Hengzhi. Development characteristics of sand-conglomerate bodies in fault-depressed basins: take Eogene Sha-3 Member in Chengnan Fault Belt as an example[J]. Oil & Gas Geology, 2001, 22(1): 52-56. doi: 10.3321/j.issn:0253-9985.2001.01.012 [7] 郝芳, 董伟良. 沉积盆地超压系统演化、流体流动与成藏机理[J]. 地球科学进展, 2001, 16(1): 79-85. doi: 10.3321/j.issn:1001-8166.2001.01.015HAO Fang, DONG Weiliang. Evolution of, fluid flow and petroleum accumulation in overpressured systems in sedimentary basins[J]. Advance in Earth Sciences, 2001, 16(1): 79-85. doi: 10.3321/j.issn:1001-8166.2001.01.015 [8] 王伟, 纪友亮, 张善文, 等. 胜利油区古近系地层水性质对储层物性的影响[J]. 高校地质学报, 2007, 13(4): 714-721. doi: 10.3969/j.issn.1006-7493.2007.04.015WANG Wei, JI Youliang, ZHANG Shanwen, et al. Effects of Paleogene formation water on physical properties of reservoirs in Shengli Oil Zone[J]. Geological Journal of China Universities, 2007, 13(4): 714-721. doi: 10.3969/j.issn.1006-7493.2007.04.015 [9] 操应长, 张少敏, 王艳忠, 等. 渤南洼陷近岸水下扇储层岩相-成岩相组合及其物性特征[J]. 大庆石油地质与开发, 2015, 34(2): 41-47. doi: 10.3969/J.ISSN.1000-3754.2015.02.007CAO Yingchang, ZHANG Shaomin, WANG Yanzhong, et al. Combination and physical property characteristics of the lithofacies and diagenetic facies for the nearshore subaqueous fan reservoirs in Bonan Sag[J]. Petroleum Geology and Oilfield Development in Daqing, 2015, 34(2): 41-47. doi: 10.3969/J.ISSN.1000-3754.2015.02.007 [10] 李会军, 吴泰然, 吴波, 等. 中国优质碎屑岩深层储层控制因素综述[J]. 地质科技情报, 2004, 23(4): 76-82. doi: 10.3969/j.issn.1000-7849.2004.04.016LI Huijun, WU Tairan, WU Bo, et al. Distribution and contro-lling factors of high quality clastic deeply buried reservoirs in China[J]. Geological Science and Technology Information, 2004, 23(4): 76-82. doi: 10.3969/j.issn.1000-7849.2004.04.016 [11] 董果果, 黄文辉, 万欢, 等. 东营凹陷北部陡坡带沙四上亚段砂砾岩储层固体-流体相互作用研究[J]. 现代地质, 2013, 27(4): 941-948. doi: 10.3969/j.issn.1000-8527.2013.04.021DONG Guoguo, HUANG Wenhui, WAN Huan, et al. Solid-fluid interaction in glutenite reservoirs of the Upper Submember, Fourth Member, Shahejie Formation in northern slope of Dong-ying Sag[J]. Geoscience, 2013, 27(4): 941-948. doi: 10.3969/j.issn.1000-8527.2013.04.021 [12] 朱筱敏, 王英国, 钟大康, 等. 济阳坳陷古近系储层孔隙类型与次生孔隙成因[J]. 地质学报, 2007, 81(2): 197-204. doi: 10.3321/j.issn:0001-5717.2007.02.008ZHU Xiaomin, WANG Yingguo, ZHONG Dakang, et al. Pore types and secondary pore evolution of Paleogene reservoir in the Jiyang Sag[J]. Acta Geologica Sinica, 2007, 81(2): 197-204. doi: 10.3321/j.issn:0001-5717.2007.02.008 [13] 张善文, 袁静, 隋风贵, 等. 东营凹陷北部沙河街组四段深部储层多重成岩环境及演化模式[J]. 地质科学, 2008, 43(3): 576-587. doi: 10.3321/j.issn:0563-5020.2008.03.012ZHANG Shanwen, YUAN Jing, SUI Fenggui, et al. Multiple diagenetic environments and evolvement model in deep formation of the 4th member, Shahejie Formation in the northern Dongying Sag[J]. Chinese Journal of Geology, 2008, 43(3): 576-587. doi: 10.3321/j.issn:0563-5020.2008.03.012 [14] 昝灵, 张枝焕, 王顺华, 等. 渤南洼陷北部陡坡带砂砾岩储层成岩作用研究[J]. 天然气地球科学, 2011, 22(2): 299-306. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX201102016.htmZAN Ling, ZHANG Zhihuan, WANG Shunhua, et al. Diagenesis of sandy conglomerate reservoir in northern steep slope of Bonan Subsag[J]. Natural Gas Geoscience, 2011, 22(2): 299-306. https://www.cnki.com.cn/Article/CJFDTOTAL-TDKX201102016.htm [15] 王永诗, 王勇, 郝雪峰, 等. 深层复杂储集体优质储层形成机理与油气成藏: 以济阳坳陷东营凹陷古近系为例[J]. 石油与天然气地质, 2016, 37(4): 490-498. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT201604006.htmWANG Yongshi, WANG Yong, HAO Xuefeng, et al. Genetic mechanism and hydrocarbon accumulation of quality reservoir in deep and complicated reservoir rocks: a case from the Palaeogene in Dongying Sag, Jiyang Depression[J]. Oil & Gas Geology, 2016, 37(4): 490-498. https://www.cnki.com.cn/Article/CJFDTOTAL-SYYT201604006.htm [16] 王永诗, 王勇, 朱德顺, 等. 东营凹陷北部陡坡带砂砾岩优质储层成因[J]. 中国石油勘探, 2016, 2l(2): 28-36. https://www.cnki.com.cn/Article/CJFDTOTAL-KTSY201602004.htmWANG Yongshi, WANG Yong, ZHU Deshun, et al. Genetic mechanism of high-quality glutenite reservoirs at the steep slope in northern Dongying Sag[J]. China Petroleum Exploration, 2016, 21(2): 28-36. https://www.cnki.com.cn/Article/CJFDTOTAL-KTSY201602004.htm [17] 吴富强, 鲜学福, 胡雪, 等. 次生孔隙形成机制探讨: 以渤南洼陷为例[J]. 油气地质与采收率, 2003, 10(1): 3-5. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS200301001.htmWU Fuqiang, XIAN Xuefu, HU Xue, et al. Discussion on the forming mechanism of secondary pores: taking Bonan Subsag in Jiyang Depression as an example[J]. Petroleum Geology and Recovery Efficiency, 2003, 10(1): 3-5. https://www.cnki.com.cn/Article/CJFDTOTAL-YQCS200301001.htm -
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