济阳坳陷探井地质风险评价方法——以陡坡带砂砾岩体为例

The Well Drilling Geologic Risk Evaluation Methods in Jiyang Depression:An Example of Glutenite Bodies at Steep Slope Belt

杨万芹

YANG Wanqin

中国石油化工股份有限公司胜利油田分公司地质科学研究院, 山东东营 257015

Geoscience Research Institute of SINOPEC Shengli Oilfields Company, Dongying Shandong 257015, China

济阳坳陷圈闭已进入隐蔽油气藏勘探阶段,当前面临的主要地质风险是不同类型隐蔽油气藏识别及含油气性判断、同一类型隐蔽油气藏的规模等。此文针对勘探重点类型陡坡带砂砾岩体建立探井地质风险评价方法,主要是从成藏地质条件和失利探井两个方面对地质风险的成因进行分析,总结成藏的主控因素,进而确定地质风险评价的地质要素,并通过地质条件和统计分析,对地质要素进行分级,建立分级标准;利用勘探成功率影响程度法,确定权系数,从而建立地质风险评价标准。用2009年已钻探井对评价标准进行检验,评价结果与钻探结果吻合率为80%,取得了较好的应用效果。

Jiyang Depression has entered into subtle reservoir exploration stage at present. The main geological risks in present exploration include the identification of different type subtle reservoirs, judgment of hydrocarbon existence and the scale of the same type subtle oil and gas reservoirs. In this paper, well drilling geologic risk evaluation methods have been established for the key glutenite bodies at steep slope belt. Through analysis of the geologic conditions for HC accumulation and the failure reasons for well drilling, the geological risk analysis has been conducted, the main controlling factors for HC accumulation have been summarized, and the geological factors for geological risk assessment have been determinated. Through analysis on the geological conditions and statistical analysis, the grade scale of the geological elements has been established. With the success rate of exploration method, the weight coefficients have been obtained, and the geological risk evaluation criteria have been established. These geological risk evaluation criteria have been proved with exploration wells drilled in 2009, and the evaluation results match well with the drilling results, with matching rate of 80%.

https://doi.org/10.3969/j.issn.1008-2336.2012.02.030