塔河油田奥陶系缝洞充填序列及其测井响应

doi:10.7657/XJPG20210106

摘要/Abstract

摘要：

碳酸盐岩缝洞充填对缝洞型储集层有重要影响,准确识别缝洞充填物类型,建立充填模式,有利于更好地识别与评价缝洞型储集层的发育情况。通过观察岩心,将缝洞充填物划分为砂泥质充填物、角砾岩充填物、化学充填物和未充填;利用测井信息标定各类充填物的测井响应特征,基于岩溶形成的主控因素将缝洞充填体分为地下暗河型、断控岩溶型及表层岩溶型3种类型,并建立充填模式。在此基础上,结合岩心观察,归纳不同充填模式的一般充填序列及其测井响应特征,发现地下暗河型更易钻遇大溶洞,断控岩溶型有利于油气的运移,表层岩溶型则多发育溶蚀孔洞。

关键词: 塔河油田, 奥陶系, 碳酸盐岩, 缝洞型储集层, 缝洞充填物, 充填模式, 充填序列, 测井响应

Abstract:

Fracture-cavity filling in carbonate rocks has an important influence on fracture-cavity reservoirs. Accurately identifying the types of fracture-cavity fillings and establishing filling patterns are conducive to better identifying and evaluating the development situations of fracture-cavity reservoirs. By observing the core, the fracture-cavity fillings can be divided into sand-shale fillings, breccia fillings, chemical fillings and empty filling. The logging response characteristics of various fillings are calibrated by using logging information. Based on the main controlling factors of karst forming, the fracture-cavity fillings can be divided into three types, namely underground river type, fault-controlled karst type, and surface karst type, and then establish filling mode. On this basis, combined with core observations, the general filling sequence of different filling modes and its logging responses are summarized. It is found that large karst caves are easier to be drilled in the fillings of the underground river type, the fillings of fault-controlled karst type is conducive to migration of oil and gas, and dissolved cavities are developed in the fillings of surface karst type.

Key words: Tahe oilfield, Ordovician, carbonate rock, fracture-cavity reservoir, fracture-cavity filling, filling pattern, filling sequence, logging response

中图分类号:

TE122.221

刘晶晶, 毛毳, 魏荷花, 权莲顺, 刘泽璇. 塔河油田奥陶系缝洞充填序列及其测井响应[J]. 新疆石油地质, 2021, 42(1): 46-52.

LIU Jingjing, MAO Cui, WEI Hehua, QUAN Lianshun, LIU Zexuan. Ordovician Fracture-Cavity Filling Sequence and Its Logging Responses in Tahe Oilfield[J]. Xinjiang Petroleum Geology, 2021, 42(1): 46-52.

图/表 5

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Table 2

图3

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井名	鹰山组顶深/m	表层岩溶带/m	垂向岩溶带/m	径流岩溶带/m	缝洞段/m	岩心特征	充填序列类型
S64井	5 470.5	5 470.5—5 515.5	5 515.5—5 555.5	5 515.5—5 625.5	5 484.0—5 490.0	灰色泥岩夹薄层角砾岩,裂隙含油	表层岩溶型
S64井	5 470.5	5 470.5—5 515.5	5 515.5—5 555.5	5 515.5—5 625.5	5 490.0—5 506.0	多角砾充填,见高角度裂缝,有擦痕	断控岩溶型
S75井	5 501.5	5 501.5—5 546.5	5 546.5—5 586.5	5 586.5—5 656.5	5 526.0—5 534.0	多种类型充填物混合充填	地下暗河型
S75井	5 501.5	5 501.5—5 546.5	5 546.5—5 586.5	5 586.5—5 656.5	5 681.0—5 689.0	巨晶方解石充填缝洞	地下暗河型
T403井	5 405.0	5 405.0—5 450.0	5 450.0—5 490.0	5 490.0—5 560.0	5 536.0—5 542.0	多种类型充填物混合充填,少化学充填物,多搬运角砾	地下暗河型
T615井	5 521.0	5 521.0—5 566.0	5 566.0—5 606.0	5 606.0—5 676.0	5 517.0—5 526.0	裂缝含油,多垮塌充填,方解石、砂泥质充填裂缝或角砾间	表层岩溶型
T615井	5 521.0	5 521.0—5 566.0	5 566.0—5 606.0	5 606.0—5 676.0	5 533.0—5 560.0	多种类型充填物混合充填,多砂岩充填,常见泥质条带,裂缝、缝合线发育	地下暗河型