摘要
准噶尔盆地五彩湾凹陷彩25井区石炭系火山岩气藏受火山喷发方式及后期构造抬升反转作用的共同影响,表现出多期间歇性喷发、各期次岩体相互叠置、充填类型多样、岩性岩相复杂的特点,加之气藏井控程度低,无法用常规的层状格架构建地层模型。为此,通过对录井、岩心、测井、地震资料的综合分析,充分考虑火山喷发的旋回性和多期性差异,划分出3期火山旋回期次,并以各旋回的地层格架作为约束条件,划分火山岩体顶、底界,搞清楚各岩体在空间上的相互叠置关系,针对不同的期次特征选用内插或外推算法,构建了体控约束下的地质模型;结合3期次不同火山岩性的测井敏感参数分析结果,利用地质统计学方法分析不同火山岩性储层的特征参数;在体控反演过程中,对各期次不同岩性建立了不同的变差函数模型,得到高分辨率的火山岩性预测数据体及有效储层分布数据体。结论认为,所得到的预测结果与多期火山喷发的地质模式相符,和实际钻遇的火山岩岩性吻合度超过92%,表明利用体控反演方法来识别多旋回复杂火山岩气藏的有效储层是可行的。
As influenced by both volcanic eruption modes and late tectonic uplift and inversion, the Carboniferous volcanic gas reservoirs in the Well Cai 25 area in the Wucaiwan sag, Junggar Basin, are characterized by multi-phase intermittent eruption, overlapping rock masses of various phases, diverse filling types, and complex lithologies/lithfacies. Moreover, there is a low degree of gas well control. Therefore, strata models cannot be established using conventional layered frameworks. Through comprehensive analysis on mud logging, cores, well logging and seismic data, three volcanic cycles are defined with consideration to the differences in cyclicity and multi-phases of volcanic eruption. In addition, with the stratigraphic framework of each cycle as constraints, top and bottom boundaries of volcanic rock mass are identified in order to determine the spatially superimposed relationship among rock masses. Based on the characteristics of the rock mass in different phases, the geological model controlled by rock mass is built using the interpolation or extrapolation algorithm. According to the analysis on sensitive parameters from logs of volcanic lithologies in three phases, the characteristic parameters of differ- ent volcanic reservoirs were analyzed by geo-statistical methods. During rock-mass controlled inversion, variogram models were built for different volcanic lithologies, and high-resolution data volume of volcanic lithology and distribution data volume of effective reservoirs were obtained. It is concluded that the predicted results are consistent with geologic models for multi-phase volcanic eruptions, and match over 92% of volcanic lithology drilled actually, indicating that it is feasible to identify multi-cycle complex volcanic gas reservoirs by rock-mass controlled inversion.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2017年第3期48-55,共8页
Natural Gas Industry
基金
中国石油天然气股份有限公司重大科技专项"特殊气藏开发技术研究与应用"(编号:2012E-34-10)
关键词
准噶尔盆地
五彩湾凹陷
石炭纪
内幕型火山岩
期次划分
多期性
地质统计学
体控反演
储层识别
Junggar Basin
Wucaiwan sag
Carboniferous
Volcanic reservoir with inner structure
Phase division
Multi-phase
Geo-sta- tistics
Rock-mass controlled inversion
Reservior identification
作者简介
仇鹏，1984年生，工程师，硕士；主要从事天然气评价与开发地质综合研究工作。地址：（834000）新疆维吾尔自治区克拉玛依市准噶尔路。ORCID：0000-0003-0646-9320。E-mail：qiupeng@petrochina．com．cn
