黄河口凹陷BZ27构造沙河街组砂岩储层致密化与油气充注关系
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摘要
基于岩石薄片、X衍射定量分析、流体包裹体偏光-荧光分析和包裹体均一化温度等资料,对黄河口凹陷BZ27构造沙河街组沙一二段致密砂岩储层的特征、形成机理及其致密化过程与油气充注史的时序关系进行了系统分析。研究结果表明,研究区致密砂岩演化过程具有明显的阶段性,其中,早成岩B期之前,主要受上覆岩层压实作用的控制造成原生孔隙的大量减少,但并未形成致密储层;早成岩B期之后,以碳酸盐胶结物为主的胶结作用的发生才是形成致密砂岩储层的主要因素。进一步根据储层致密化过程分析和油气成藏期确定的结果来看,BZ27构造沙河街组油气成藏表现为先致密后成藏的特点,在致密化过程早期伴随有一期小规模的烃类充注,而在距今6Ma的烃类大规模充注之前,储层已完全致密。
Based on the data of rock thin-sections,X-ray diffraction,polarization-fluorescence and homogenization temperature of fluid inclusions,we systematically analyze the reservoir characteristics,the formation mechanism,and the sequential relationship between sandstone densification process and hydrocarbon charging history of the tight sandstone in the 1st and second members of Shahejie Formation in BZ27 structure of Huanghekou Depression.The results show that the main factors for the sandstone reservoirs deterioration are compaction and carbonate cementation,however,the compaction only reduced the primary pores in the early stage of diagenesis and the sandstone reservoir densification was mainly controlled by carbonate cementation in the later stage of diagenesis.The results of reservoir densification process and hydrocarbon accumulation period indicate that the hydrocarbon accumulation in the Shahejie Formation of the BZ27 structure is characterized by compaction earlier than accumulation.The scale of the hydrocarbon charging wassmall in the early stage of the densification process,but larger after the reservoir was fully densified at 6Ma.
Based on the data of rock thin-sections,X-ray diffraction,polarization-fluorescence and homogenization temperature of fluid inclusions,we systematically analyze the reservoir characteristics,the formation mechanism,and the sequential relationship between sandstone densification process and hydrocarbon charging history of the tight sandstone in the 1st and second members of Shahejie Formation in BZ27 structure of Huanghekou Depression.The results show that the main factors for the sandstone reservoirs deterioration are compaction and carbonate cementation,however,the compaction only reduced the primary pores in the early stage of diagenesis and the sandstone reservoir densification was mainly controlled by carbonate cementation in the later stage of diagenesis.The results of reservoir densification process and hydrocarbon accumulation period indicate that the hydrocarbon accumulation in the Shahejie Formation of the BZ27 structure is characterized by compaction earlier than accumulation.The scale of the hydrocarbon charging wassmall in the early stage of the densification process,but larger after the reservoir was fully densified at 6Ma.
引文
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[3]邹才能,朱如凯,吴松涛,等.常规与非常规油气聚集类型、特征、机理及展望:以中国致密油和致密气为例[J].石油学报,2012,33(2):173-187.
[4]翟光明,王世洪,何文渊.近十年全球油气勘探热点趋向与启示[J].石油学报,2012,33(增刊1):14-19.
[5]魏刚,杨海风,冯冲,等.渤海海域沙南凹陷沙二段储层成岩作用及其对储集层的影响[J].地质科技情报,2017,36(4):160-165.
[6]薛永安,杨海风,徐长贵.渤海海域黄河口凹陷斜坡带差异控藏作用及油气富集规律[J].中国石油勘探,2016,21(4):65-74.
[7] Ajdukiewicz J M,Lander R H.Sandstone reservoir quality prediction:The state of the art[J].AAPG Bulletin,2010,94(8):1083-1091.
[8] Pittman E D,Larese R E.Compaction of lithic sand experimental results and application[J].AAPG Bulletin,1991,75(8):1279-1299.
[9] Scherer M.Parameters influencing porosity in sandstones:A model for sandstone porosity prediction[J].AAPG Bulletin,1987,71(5):485-491.
[10]Beard D C,Weyl P K.Influence of texture on porosity and permeability of unconsolidated sand[J].AAPG Bulletin,1973,57(2):349-369.
[11]杨伟伟,石玉江,李剑峰,等.鄂尔多斯盆地华池地区X96井长7烃源岩地球化学特征及其对致密油成藏的意义[J].地球科学与环境学报,2016,38(1):115-125.
[12]柳广弟,张厚福.石油地质学[M].第4版.北京:石油工业出版社,2009.
[13]李军,胡东风,邹华耀,等.四川盆地元坝-通南巴地区须家河组致密砂岩储层成岩-成藏耦合关系[J].天然气地球科学,2016,27(7):1164-1178.
[14]郭小文,刘可禹,宋岩,等.库车前陆盆地大北地区砂岩储层致密化与油气充注的关系[J].地球科学,2016,42(3):394-402.
[15]王波,杨海风,王孝辕,等.黄河口凹陷陡坡带BZ27构造古近系油气成藏期:基于流体包裹体的证据[J].断块油气田,2016,23(6):693-696.