INTERPRETATION AND EVALUATION WITH DRILLING FOR MESOZOIC IGNEOUS BURIED HILL FRACTURED RESERVOIRS IN THE LIAOXI UPLIFT
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摘要:
辽西凸起南端X构造中生界为裂缝型火成岩潜山，裂缝发育极不均匀，同时，中生界油气藏地质响应特征与上部常规储层油气藏特征明显不同；钻井作业过程中出现的复杂工程因素对综合录井资料质量造成极大影响，这加大了录井综合解释以及储层有效性识别评价难度。通过对录井资料质量甄别筛选，优选出真实反映地层流体的指示参数，并结合录井工程参数建立了潜山储层录井评价标准，对储层流体进行准确解释评价。对比取样及测试结果发现，本构造的录井综合解释标准及解释方法极大提高了中生界火成岩储层流体解释评价的符合率；为围区火成岩储层流体解释评价及复杂井况下的录井油气层综合解释提供全新的解释思路，指导了X构造高产轻质油田的发现，实现了辽西凸起X构造油气勘探的突破，对渤海湾勘探具有重要指导意义。
Abstract:The Mesozoic of X structure in the south end of Liaoxi Uplift is a buried hill reservoir consisting of fractured igneous rocks, and the distribution of fractures is extremely uneven. The geological responses of the Mesozoic reservoirs are obviously different from the conventional reservoirs lying above them. The complicated engineering factors adopted during drilling process have great impacts on the quality of logging data, and may bring many difficulties to the integrated data interpretation and the identification and evaluation of reservoir effectiveness. In this paper, after careful quality screening of logging data, indication parameters, that may truly reflect the formation fluid, are selected. Together with the logging engineering parameters, a logging evaluation standard for buried hill reservoir is established for accurate interpretation and evaluation of the reservoir fluid. Comparison with the sampling and testing results suggests that the integrated logging interpretation standard and interpretation method for the structure has been greatly improved. The improvement of coincidence rate of fluid interpretation and reservoir evaluation proves that it is a new approach for fluid interpretation and igneous reservoirs evaluation and could be used in surrounding areas under complicated well conditions. It successfully helped the discovery of the high yield light oil field in X structure and is a breakthrough of oil and gas exploration in the X structure of Liaoxi Uplift as a case with important reference value for future exploration.
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表 1 气测时间曲线数据对比
Table 1. Comparison of gas logging time curve data
钻进
状态时间 Bit 深度/m T GAS/×106 C1/×106 C2/×106 C3/×106 iC4/×106 nC4/×106 iC5/×106 nC5/×106 钻水泥塞 16:35:00 3 391.99 512 9 2 4 5 13 13 26 钻水泥塞 16:37:00 3 398.54 846 40 8 26 23 60 42 54 钻水泥塞 16:39:00 3 401.11 6 667 63 24 161 147 402 269 329 钻水泥塞 16:41:00 3 401.93 10 037 51 29 234 225 628 421 542 钻水泥塞 16:44:00 3 402.14 12 182 42 29 247 250 703 481 638 钻水泥塞 16:46:00 3 402.43 12 584 38 28 235 242 686 477 646 钻水泥塞 16:48:00 3 402.51 13 177 38 27 233 240 683 479 649 钻水泥塞 16:50:00 3 402.69 13 448 38 27 228 238 679 479 649 钻新地层 16:52:00 3 402.88 13 700 38 27 225 236 673 477 650 钻新地层 16:54:00 3 403.08 13 644 38 26 218 230 660 470 643 钻新地层 16:56:00 3 403.27 13 301 37 25 209 222 639 460 633 钻新地层 16:58:00 3 403.59 13 404 39 25 208 220 638 459 631 钻新地层 17:00:00 3 403.78 13 257 40 26 199 214 617 447 619 钻新地层 17:02:00 3 403.88 13 151 41 25 192 205 596 434 604 钻新地层 17:04:00 3 404.00 13 285 44 25 192 205 597 435 603 钻新地层 17:06:00 3 404.27 13 132 47 25 187 201 584 429 598 钻新地层 17:08:00 3 404.50 12 673 46 24 177 192 561 415 581 钻新地层 17:10:00 3 404.53 12 611 48 24 175 190 554 411 575 钻新地层 17:12:00 3 404.64 12 413 51 26 174 189 550 409 571 
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表 2 辽西凸起X构造火成岩储层录井随钻解释评价标准
Table 2. Interpretation and evaluation criteria with drilling for igneous reservoir of X structure in Liaoxi Uplift
评价参数
储层类型VoL C1
/( mL/L)C1异常倍数 三维对比级 R 有效储层 >1.0 >2.0 >4.0 <0.42 无效储层 <1.0 <2.0 <4.0 ≥0.42
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表 3 X2井中生界随钻解释成果表
Table 3. Mesozoic fluid interpretation results for well X2
解释序号 顶深
/m底深/m VoL C1
/(mL/L)C1异常倍数 对比级 R 储层
类型录井解释 测试结论 1 3 408 3 414 1.3241 2.62 5.5 0.27 有效储层 油层 油层 2 3 418 3 426 1.1638 3.55 5.8 0.36 有效储层 油层 油层 3 3 436 3 439 3.5762 4.12 4.1 0.31 有效储层 油层 油层
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