Response of formation water chemical fields to evolution of lacustrine basin of the Paleogene in Zhanhua Sag of Jiyang Depression and its hydrocarbon significance
Chen Zhonghong1, Wang Li2, Yang Yong3, Zha Ming1
1 College of Geo-Resources and Information， China University of Petroleum(East China)， Dongying 257061， Shandong 2 Petroleum Developing Center in Shengli Oilfield， SINOPEC， Dongying 257061， Shandong 3 Exploration and Development Research Institute， SINOPEC, Beijing 100083
Abstract On the basis of calculation and analyses of 1160 testing data including salinity， formation water types， content of ions and physical properties of crude oil， the Paleogene formation water chemical field in Zhanhua Sag was investigated. The results show that the formation water chemical field has a good response to the evolution of lacustrine basin， the average salinity and content of ions decreased with the lake level deepening and desalinating from the initial faulted stage to the peak stage of fault development(the Member 4 to Member 3 of Shahejie Formation);The average salinity and content of ions increased with lake level shoaling in lake basin withering period(the Member 2 of Shahejie Formation to the Dongying Formation). Typical characteristics of an opening faulted lacustrine basin were displayed by the low content of total salinity and ions(total salinity averaged by 10 g/L)， NaHCO3 formation water being the dominant type(with a proportion of 80％)， and the high values of rNa+/rCl- and［rHCO-3+rCO2-3］/rCl-(the average values respectively higher than 1.0 and 50)， which indicated the stronger metamorphic process and alternation of the formation water. Influenced by the opening formation water chemical fields， the viscous crude oil was widespread and the widespread secondary heavy crude oil was the result of water-flush， oxidization and biodegradation in the course of oil migration， accumulation and preservation in opening formation water chemical fields. The samples with NaHCO3 type were mainly distributed in the formation water with a lower salinity（<15 g/L）， which indicated the opening hydrogeology and unfavorable preservation conditions for hydrocarbon. The formation water of NaHCO3 type with a higher salinity（>15 g/L）was mainly distributed in the Bonan subsag and the Yidong faulted zone. Its origin was relative with oil and gas fields and a high content of CO2 from mantle by the connection of faults， and correspondingly the density of crude oil was lower than 0.9 g/mL generally， which indicated favorable conditions for hydrocarbon preservation.
About author: Cheng Zhonghong，born in 1976， is an associate professor of China University of Petroleum(East China). He is mainly engaged in teaching and researches of petroleum geology.
Cite this article:
Chen Zhonghong,Wang Li,Yang Yong et al. Response of formation water chemical fields to evolution of lacustrine basin of the Paleogene in Zhanhua Sag of Jiyang Depression and its hydrocarbon significance[J]. JOURNAL OF PALAEOGEOGRAPHY, 2009, 11(5): 551-560.
Chen Zhonghong,Wang Li,Yang Yong et al. Response of formation water chemical fields to evolution of lacustrine basin of the Paleogene in Zhanhua Sag of Jiyang Depression and its hydrocarbon significance[J]. JOPC, 2009, 11(5): 551-560.
陈中红，查明. 2008a. 断陷湖盆超压发育特征及其与油气成藏的关系——以渤海湾盆地沾化凹陷为例［J］.石油学报，29(4): 509-515. 陈中红，查明. 2008b. 断陷湖盆超压封存箱形成机理与油气成藏机制［J］.地质科学， 43(1):50-64. 陈中红，查明. 2009. 陆相断陷咸化湖盆地层水化学场响应及与油气聚集关系——以渤海湾盆地东营凹陷为例［J］. 地质科学， 44(3)，待刊. 楼章华，金爱民，朱蓉，等. 2006.松辽盆地油田地下水化学场的垂直分带性与平面分区性［J］.地质科学， 41(3):392-403. 李伟，吴智平，周瑶琪，等. 2006.沾化凹陷东北部中新生代盆地演化过程研究［J］.煤田地质与勘探， 34(3):20-23. 吕希学，胡斌，姜在兴，等. 2003.济阳坳陷车镇和沾化凹陷古近系沙河街组遗迹群落及其沉积环境［J］.古地理学报， 5(2):187-196. 王仲侯，张淑君. 1998.克拉玛依油田高矿化度重碳酸钠型水的发现与特征［J］.石油实验地质， 20(1):39-43. 吴智平， 李伟， 郑德顺， 等. 2004.沾化凹陷中、新生代断裂发育及其形成机制分析［J］.高校地质学报， 10(3):405-417. 曾溅辉，吴琼，钱诗友，等. 2008.塔里木盆地塔中低凸起地层水化学特征对不整合的响应［J］.古地理学报， 10(5):537-543. 张小莉，查明，赫拴柱，等. 2006. 渤海湾盆地廊固凹陷地层水化学纵向分带性与油气富集［J］.石油实验地质， 28(2):187-190. 查明， 陈中红， 张年富， 等. 2003. 准噶尔盆地陆梁地区水化学特征与油气运聚［J］.地质科学， 38(3):315-322. 朱光有，金强，丁浩，等. 2003.济阳坳陷沾化断陷湖盆沙河街组生烃系统特征［J］.天然气工业， 23(增刊):10-12. 朱光有，金强，高志卫，等. 2004a.沾化凹陷复式生烃系统及其对油气成藏的控制作用［J］.海洋地质与第四纪地质， 24(1):105-110. 朱光有，金强，张水昌，等. 2004b.陆相断陷盆地复式成烃及成藏系统研究——以济阳坳陷沾化凹陷为例［J］. 石油学报， 25(2):12-18. Bachu S. 1995.Flow of variable-density formation water in deep sloping aquifers: Review of methods of representation with case studies［J］. Journal of Hydrology， 164: 19-38. Bachu S. 1997. Flow of formation water， aquifer characteristics， and their relation to hydrocarbon accumulations， northern Alberta Basin［J］. AAPG Bulletin， 81: 712-733. Cai C F， Hu W S， Worden R H. 2001. Thermochemical sulphate reduction in Cambro Ordovician carbonates in Central Tarim［J］. Marine and Petroleum Geology， 18: 729-741. Cai C F， Worden R H， Bott rell S H， et al. 2003.Thermochemical sulphate reduction and the generation of hydrogen sulphide and thiols(mercaptans)in Triassic carbonate reservoirs from the Sichuan Basin， China［J］. Chemical Geology，20: 39-57. Cai C F， Xie Z Y， Worden R H， et al. 2004. Methane-dominated thermochemical sulphate reduction in the Triassic Feixianguan Formation East Sichuan Basin， China：Towards prediction of fatal H2S concent rations［J］. Marine and Petroleum Geology， 21: 1265-1279. Hitchon B， Brulotte M. 1994. Culling criteria for ‘standard formation water analyses［J］. Applied Geochemistry，9:637-645. Michael K， Bachu S. 2001.Fluids and pressure distributions in the foreland-basin succession in the west-central part of the Alberta Basin， Canada: Evidence for permeability barriers and hydrocarbon generation and migration［J］. AAPG Bulletin， 85: 1231-1252. Zhang T W， Zhang M Z， Bai B J， et al. 2008. Origin and accumulation of carbon dioxide in the Huanghua depression， Bohai Bay Basin， China［J］. AAPG Bulletin， 92(3):341-358.
