柴达木盆地伊克雅乌汝地区狮子沟组（N2^3）生物气特征及资源潜力评价  

Characteristics of Biogenetic Gas and Resource Potential Evaluation of Shizigou Formation of Neogene in Yikeyawuru Area of Qaidam Basin

作　　者：王金鹏[1] 彭仕宓[1] 管志强[2] 姜桂凤[2] 徐子远[2] 张道伟[2] 彭德华[2] 

机构地区：[1]中国石油大学(北京)资源与信息学院,北京102249 [2]青海油田公司勘探开发研究院,甘肃敦煌736202

出　　处：《石油天然气学报》2007年第1期1-6,共6页Journal of Oil and Gas Technology

摘　　要：通过对柴达木盆地伊克雅乌汝地区新近系狮子沟组（N2^3）生物气及其烃源岩地球化学特征、形成条件的分析，并选用面积丰度地质类比法估算了生物气资源量，评价了资源潜力。研究表明，N2^3层段气体占δ^13 C1值为-67．3%，C1／（C2＋C3）为587，气体组份以甲烷为主，含量达98．01％，为生物气特征。而N2^3层段稳定快速的沉积／沉降，寒冷的气候条件和高盐度的水体环境为生物气形成创造了有利条件。其气源岩主要为暗色泥岩，有机碳含量主要分布在0．2％～0．6％之间，有机质类型以Ⅱ2型和Ⅲ型为主。采用面积丰度地质类比法，确定该区类比储量丰度为1．96×10^8m^3／km^2，地质资源量为1262×10^8m^3，而伊深1井于N2^3层段首次获得生物气工业气流，上交控制储量为121．03×10^8m^3，表明研究区具有良好的生物气资源潜力。The geochemical characteristics and forming conditions of biogenetic gas and its source rocks in Shizigou Formation of Neogene in Yikeyawuru Area of Qaidam Basin are analyzed. Based on geologic analyses, area abundance geologic analogic method is chosen to evaluate biogenetic gas resource of the formation. It is indicated that δ13C1 value is-67.3‰; C1/(C2+C3) is 587; methane content in the gas sample collected from N32 is 98.01%. All of these evidences show a biogas feature. In the case of N32, a stable and fast sedimentation and subsidence, cold climate condition and high salinity water environment provide favorable conditions for biogas forming. Its source rock is mainly of dark mudstone, of which organic hydrocarbon content is 0.2%～0.6%. the main types of organic matters are Type Ⅱ2 (sapropelic-humic type) and Type Ⅲ (humic type). According to evaluation results of area abundance geologic analogic method, the reservoir abundance of this area in N32 formation is 1.96×108/km2, and geologic resource is 1262×108m3. Especially, a commercial biogas flow is found in N32 of Well Yishen-1, and control reserves of 121.03×108m3 is evaluated. And these show that there exist promising biogas resource and exploration potential.

关 键 词：柴达木盆地 伊克雅乌汝地区 狮子沟组 生物气 资源评价 

分 类 号：P618.13[天文地球—矿床学]